Malicious PDF — malware analysis report

Static analysis result for SHA-256 99acc6be949de147…

MALICIOUS

PDF

84.1 KB Created: 2021-03-22 20:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c41196cd15cf8223c89274528653fd9a SHA-1: 2998fa8151923b51e84c886b03ed716817b6451e SHA-256: 99acc6be949de147a7eb09b1c08453ecf2a005abb1709ed557266a6e7a11dafa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, containing numerous external URLs designed to redirect users. The primary lure appears to be a "world building template" which leads to a URL containing "strik" and a UTM term. The presence of a ClamAV detection for "Pdf.Phishing.Trojan" and a high ML classifier score strongly indicate malicious intent, likely to exploit users through phishing or by serving further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://baarspo.ru/strik?utm_term=world+building+template+reedsy PDF link annotation
    • http://sajiwurejedetu.sportsontheweb.net/arturia_keylab_61_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5ffe85c9a2bf1.pdfIn PDF document text
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/tuzebarewasapidovab.pdfIn PDF document text
    • http://litazil.22web.org/cakewalk_sonar_artist_manual.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/sudutud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_6046e4a99ce86.pdfIn PDF document text
    • http://busoxafe.22web.org/emulation_ritual_book.pdfIn PDF document text
    • http://vuzitofakomuj.22web.org/pifopisutikavus.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/vanusarudinug.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/wipuni.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/3e378f6e51156ab.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/durga_saptashati_telugu_download.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/f6d53018-e860-4f7a-8c8d-bed758aee284/soguw.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_936997f54ae449f192874dcc593faed7.pdf?index=trueIn PDF document text
    • http://tukutuxobolekub.epizy.com/15634714605.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_1a7937e3b9654ef7a47730a3f4193976.pdf?index=trueIn PDF document text
    • http://sanusowadatuj.epizy.com/49285981747.pdfIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_4edac7e0e8e24340bd90725d96884cd0.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_af7e1affc2e74b4592b8a7003f42b951.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21e0d69-0640-4809-8738-47aec70a6aca/dell_b2375dnf_mono_mfp_default_password.pdfIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/how_to_manually_drain_lg_washer.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_ee6f352cda41446995159805976bf9ae.pdf?index=trueIn PDF document text
    • http://vobikeretuwof.atwebpages.com/vuvibotumu.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 5536 bytes
SHA-256: ec03191b09d74f35dc8ae2211d95327e6e8f3b88878385dfcd729eeac7587b2b
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 1888 bytes
SHA-256: ac14972b7b2947834c866a693307dd83921f9e40fad0e2ab592cecd13463aa54
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 10636 bytes
SHA-256: 56d40d75c5cdd10ddfb40dd700203082e29a8e60783ee7bcadfcd048740fe977

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