Malicious PDF — malware analysis report

Static analysis result for SHA-256 1806bd91ce7cd42d…

MALICIOUS

PDF

83.9 KB Created: 2021-03-23 04:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a0a3bcdc07d0aaf9b8364efe1f183f64 SHA-1: 28aa17e9bf625c43b33ca765b1a798a5127b1321 SHA-256: 1806bd91ce7cd42dd32af31da6cbc560b47c726fbb0353572b376409cff3f876
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/strik?utm_term=is+love+in+the+time+of+cholera+a+good+book PDF link annotation
    • https://xewomilofapo.weebly.com/uploads/1/3/4/8/134878854/0e3c030c23.pdfIn PDF document text
    • https://zuwisikap.weebly.com/uploads/1/3/4/4/134441997/jewejiboki.pdfIn PDF document text
    • http://meetraisins.club/riguzejasooz8k.pdfIn PDF document text
    • http://romeoplanet.club/kathi_songs_tamil7imc0.pdfIn PDF document text
    • http://milanomoda-italy.website/tennis_champs_returns_apk_3._0._4uer46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fe674f141a23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447647/normal_6003dc44366ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_602189324e900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5fdfcb4703cae.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/3196427.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/gidhfgd/59191294721.pdfIn PDF document text
    • http://filfex.ru/23953369554ttb55.pdfIn PDF document text
    • http://shopsupergood.site/22766313035v8qd3.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/Jhcggjd/mamosabilokifasuzokigi.pdfIn PDF document text
    • http://jilet2.club/wumanowevofotoxio925.pdfIn PDF document text
    • http://indital.space/dazalosofazizs80k.pdfIn PDF document text
    • https://xovadesunuzavam.weebly.com/uploads/1/3/4/4/134479636/3958888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_4dfccc594671427593d492c81ed438da.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_d7bbec33be214e548e2b0705f478169b.pdf?index=trueIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_626be4b7a58d4c67ace92c6ced67f63e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 5636 bytes
SHA-256: 0e64b93f014afd37b8d2fbb25c56cd74d7b1a9def42c68dd99ed58c1504cfdf1
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 10952 bytes
SHA-256: 33cb9bceac462e11311c6569783c362ae0150bc6144af9e1972265e5794a1504
font_02_sfnt_off00012b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 16116 bytes
SHA-256: 32ed552f28c08e6da84c6f9a06221233fd0d7dc1daadb77662ac87960b838a5a