Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da9c60d656a9b48…

MALICIOUS

PDF

76.5 KB Created: 2021-05-31 06:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8650b4034174e3dbfce3f3d0a3a2a633 SHA-1: 2f50e3917c5458f8230870462672efe6f342c054 SHA-256: 2da9c60d656a9b48466f71dc8ec370d40c5ee2b72c723e615b8ae7f68d0bafa8
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'SE_CALLBACK_LURE' suggests a phishing pretext, likely to trick users into clicking the embedded URLs. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=elite+daily+gift+guide
    • https://cdn-cms.f-static.net/uploads/4501509/normal_60582b900a8fe.pdf
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fe58a497a5cd.pdf
    • https://static.s123-cdn-static.com/uploads/4456389/normal_5fcc249564ed0.pdf
    • https://cdn-cms.f-static.net/uploads/4478687/normal_600b6bb006f68.pdf
    • https://zomubotedop.weebly.com/uploads/1/3/0/8/130873922/vowedika_visoka_dixuzirib_vimotavemivif.pdf
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/lokemidu_paxodasunolu.pdf
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5fd07ab746660.pdf
    • https://cdn-cms.f-static.net/uploads/4368238/normal_60343a529fb3d.pdf
    • https://cdn-cms.f-static.net/uploads/4496815/normal_6046f8c2e3cec.pdf
    • https://gebotela.weebly.com/uploads/1/3/4/3/134318039/muniwogeki_zezavenubuxagon.pdf
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5ffe4d4080a55.pdf
    • https://cdn-cms.f-static.net/uploads/4383689/normal_60617a19424d5.pdf
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5ff5199c8fa0a.pdf
    • https://static.s123-cdn-static.com/uploads/4392660/normal_60047f2084a36.pdf
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/eeb9720c6.pdf
    • https://cdn-cms.f-static.net/uploads/4459324/normal_60302c3eb3441.pdf
    • https://static.s123-cdn-static.com/uploads/4458144/normal_60005c2755701.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/60d25e76-d56c-4613-ac18-611ee9f814f3/vocabulary_from_latin_and_greek_roots_unit_9_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/ab96469d-09eb-40d8-8898-4d1bbd035e3e/tivivixogekozaxeg.pdf
    • https://uploads.strikinglycdn.com/files/fb172775-0f20-49fe-aee1-2c0df21bb5cb/innova_3100j_diagnostic_code_reader.pdf
    • https://uploads.strikinglycdn.com/files/f36b3df8-eebb-4ee7-8844-a5c2288d9c28/wimegagokabufamijuberu.pdf
    • https://uploads.strikinglycdn.com/files/176d40af-380a-4c26-b549-c0fca3d602de/traxxas_stampede_2wd_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/ab9040a5-2f49-4b24-b4cc-373748204b36/la_catedral_del_mar_barcelona.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee41.bin
b5df3dce5b4c18a992687b968b12b16b66e0f724e6e3ba2561ef80f01e9127cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 4860 bytes
font_01_sfnt_off0000fef7.bin
ddadd9ddc89f59346c31011ba68cdf2dab616af69abbe7623d24ddf8dcd3ae22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 11168 bytes

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