Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebd364fe3f75383…

MALICIOUS

PDF

74.7 KB Created: 2021-04-08 08:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b95b38ab2952b554fe907123458179a3 SHA-1: 50ad97844201d3aeefd0ccb45c2d341689cc3d23 SHA-256: 1ebd364fe3f75383ec1f48f7241e3fa0daa797dff9e6a4e0224486771b3b0821
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://crophysi.ru/123?utm_term=allergic+reaction+treatment+pdf PDF link annotation
    • http://securespot.ru/how_to_think_and_grow_rich_summarybxpuw.pdfIn PDF document text
    • http://osmosiotzs.fun/woxamulaxozulewoxurij4h6wy.pdfIn PDF document text
    • http://verification-help.business/trail_climb_hack_apk_1._20be144.pdfIn PDF document text
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/2a4d9f63528.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/4gfjgHC/aarp_insurance_payment.pdfIn PDF document text
    • http://fabermanufacture.ru/acido_nitrico_ecuacion_quimica_balanceadauoifp.pdfIn PDF document text
    • http://small-italy.space/kixikaduvosy2pdq.pdfIn PDF document text
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/ginev.pdfIn PDF document text
    • https://tejojobowadame.weebly.com/uploads/1/3/0/8/130874570/fumamip.pdfIn PDF document text
    • https://fekizozawar.weebly.com/uploads/1/3/4/3/134338272/taxux.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/pcGuTgc/kumazakezuzede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wegugus/bodomofalewalavekinaf.pdfIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_0b306b8037b44046b713f373586d6e2c.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_ebc0b1f9070e42b38434059d0a9144af.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_7a34584370e64f0da2da09aabadf8646.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_dac22b4c31b1443fa53c1a75411078e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/what_is_digital_communications_santivirus.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/12201034547.pdfIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_b51122a4f2704b3a8e28db0bca30644c.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_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 5284 bytes
SHA-256: 2952e98ce3c3a048a36b70aeffcafdb890463ea9d640375738f8967446dc6a7b
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 10228 bytes
SHA-256: e6cbf37c541bc14fe3572e271a49b56ff89d31916810d31293288a40a5ac0ee3

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