Malicious PDF — malware analysis report

Static analysis result for SHA-256 536954c22d11d0e9…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 11:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 92444c60925b1107f7862ec73e5039de SHA-1: 4bed969f6e3dfa031779664b0cea272d18b4c3d7 SHA-256: 536954c22d11d0e9703b1e309798e5bb67684a01670a41fae759970c4f602f8c
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a phishing lure, specifically impersonating Facebook. It includes numerous embedded URLs, with at least one leading to a suspicious domain designed for credential harvesting. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://xajibur.ru/aws?utm_term=shadowrun+sixth+world+core+rulebook+free+pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/aws?utm_term=shadowrun+sixth+world+core+rulebook+free+pdf PDF link annotation
    • http://monubagujizud.mywebcommunity.org/blender_2._8_tutorial_beginner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5ffc474ceb898.pdfIn PDF document text
    • http://sdfafq.info/mewivogalipwj.pdfIn PDF document text
    • http://gratoraama.website/2015_john_deere_z425_reviewsomdwv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_6046f4f515f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_60355a921a999.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/kudefexonelapixm9q7.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/rirovegowoniv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377391/normal_60035fa12ab10.pdfIn PDF document text
    • http://shop50off.info/why_is_my_kenmore_elite_dishwasher_not_starting18xhd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozidonozali.myartsonline.com/pepivuwa.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_7e23ac980a5a4af98001146396d5d94d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5e4bc1-080e-4013-8323-762dc283a913/why_is_it_important_to_know_the_history_of_contemporary_arts_in_the_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cce3794-e404-47cd-b486-52e94f1c4ae8/21758160857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2655903c-0f81-4121-9e7e-1a74a1f6be73/trane_xe_1200_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda4fb11-826f-4e45-a593-52462422dcbb/11769384457.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_a0564aba90544d59ab2b0a46541ee717.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_3f821da31e094ba687e652b26ac90f13.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_9b1f48b0df4f45579590d4e32f91e641.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_5807b4fa783f4db88c88be4eac62c6c6.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_f33dbcc81a7840cbb170807de78f0f67.pdf?index=trueIn PDF document text
    • http://dirulibas.onlinewebshop.net/how_do_i_connect_my_fintie_keyboard.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_c0b8e7b0160245598c53d3defcff39a2.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_b4d7aa9b1d2848618feba09c3e3bccc2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 5708 bytes
SHA-256: e63986c95a721ddada77a4c78b726f72cc167b3e01cac58ecd2beb777013adc0
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 10788 bytes
SHA-256: bd1a69ba58c12e31617a816e0e0808fc6b477c85917dfd80c6e6e741b99d4f09