Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2239c57fa7026e…

MALICIOUS

PDF

113.0 KB Created: 2021-03-08 21:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 93cae021fe696d02db7c847bda22ca61 SHA-1: 48f0d48ea8a2672b456d3a7d5bc3da88c8e11bda SHA-256: fb2239c57fa7026e095badd8c5862a201201444c41ec370e3da31b86829f4854
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it is a link farm on disposable hosting, with external URIs pointing to suspicious domains. The ML classifier also strongly suggests maliciousness. Although no executable scripts were found, the embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/123?utm_term=british+museum+private+tour+guide PDF link annotation
    • http://liwurivosopap.medianewsonline.com/how_to_fit_caravan_decals.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/how_big_is_a_1_8_scale_rc_car.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/mjggmjs/ice_scream_2_horror_neighborhood.pdfIn PDF document text
    • https://cdn.sqhk.co/piravasufinu/hggcEi2/download_uc_browser_apk_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/Yjjeihv/kogumovej.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/intel_guardfish_dq965gf_drivers_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/jyjjjbw/unfollowers_and_ghost_followers_for_instagram_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccad510-7f99-48fa-bb99-01ad64b87f0f/xl_big_green_egg_table_hole_size.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/tusunibip.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_e83623da4bd64ce5b9b20436638a0c82.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_5790fc01cb42424c8c765398ea0bbe88.pdf?index=trueIn PDF document text
    • http://laxufazekez.atwebpages.com/xokinoduxixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56d5137-c05d-4801-98ff-911da669e427/should_i_buy_maschine_mk3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57cafe81-0160-493c-bbd2-34f0fc9d77f7/are_beats_studios_worth_it.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_7fc90461a54c4a728f5fa9d5541d49b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/creative_cv_template_design_free.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_42428f049cd54d8cb19455c50a6b29e7.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_off00017e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E03 5448 bytes
SHA-256: 0cc66a4f5ab0adcb8482903fa94bab38f094aebd7d21428b16684025058669a9
font_01_sfnt_off00019069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19069 11848 bytes
SHA-256: ebef777ac738fb5a8ba305ee1f00d0fb936e3b557e7ab7453e0d4ce65873be8c

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