Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fe6a8499a50d61…

MALICIOUS

PDF

77.2 KB Created: 2021-03-24 22:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2d49bd42b2160a49bea10f9ac4067add SHA-1: 64647ad4e7d72504c4f830729e024a4dfd1240d9 SHA-256: 53fe6a8499a50d61b1f82e4f2e8b00924b359fc7dc01141047a03be0eb349892
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=verset+biblique+d+encouragement+pdf PDF link annotation
    • http://pubggaming.online/blue_is_the_warmest_color_watch_online_free_123_english_subtitlesj7dtk.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/96897178289.pdfIn PDF document text
    • http://aires.fun/5365215690klglg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_60581ab42206a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5fd5fe811f670.pdfIn PDF document text
    • http://soldonlittleton.com/far_cry_primal_rare_deerjeqx2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_603586a6216b0.pdfIn PDF document text
    • http://devlp.design/87085373327y8fwn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_604845bc95a71.pdfIn PDF document text
    • http://shoop-fg.ru/android_camera2_api_tutorialhqtnf.pdfIn PDF document text
    • http://okclub.org/legevuvitigosotutevlcw5j.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/67905922241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5ff1d8bd63f57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_66268d54098049eea06f23c19b2f0ad1.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_bbea7a16d5d14121b5d3304f0060533d.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_97cf54c1c18d4b27b7ae8aef01ac0554.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_c89cab8d866a4792a3fd13081c0195a8.pdf?index=trueIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_344e78773e234200a85d805e8e50f1b5.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_7ebf3cf7d225422181577f6aea2fc7d9.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_9076b614b82440dc894a3de07a90eb83.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_edf337353d67413e9d27b42901c2d991.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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 5708 bytes
SHA-256: 629ea65231d255a62ae7ce7ecff273f12f3026a2bd260f4aead5db3cb509e603
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 12056 bytes
SHA-256: 3534c08c9e37c8dcb58cc551649aebc6fe9563fd05f04d631d24e69cdec7897c