Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c91d20c033bc2d…

MALICIOUS

PDF

121.5 KB Created: 2021-04-04 06:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f8715bfc1c683500404d3322363650c3 SHA-1: bb6c8c5ab85e6cac6ca1e261181fc9dc653bfe5d SHA-256: c1c91d20c033bc2dd9588b18fce3c2550a32cb9fe16e31e3adc51a2c463d4487
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external links to disposable hosting domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a potential attempt to trick users into downloading password-protected archives, a common tactic for evading security scans. The primary attack pattern involves directing users to external malicious or phishing content via a dense network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/award?keyword=public+finance+and+public+policy+solutions+manual+pdf PDF link annotation
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/a025da96430.pdfIn PDF document text
    • https://rubazepenomul.weebly.com/uploads/1/3/4/3/134324915/c3f21a2d39ec6.pdfIn PDF document text
    • https://lufokojas.weebly.com/uploads/1/3/5/3/135398832/purizeliraz_sebera_kamopegakamili.pdfIn PDF document text
    • https://fobepomakiroka.weebly.com/uploads/1/3/0/8/130874330/kulol_sipomemepim_vumexazo.pdfIn PDF document text
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/888aa.pdfIn PDF document text
    • https://wenakewijota.weebly.com/uploads/1/3/4/6/134611788/646a698.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/a7cadada0e779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5ff67713ede29.pdfIn PDF document text
    • https://xoxopazivufa.weebly.com/uploads/1/3/5/3/135398299/19a55d4b4cd92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_604ba97a93bff.pdfIn PDF document text
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/xilux-bajepigo-lifonave-kozadufosa.pdfIn PDF document text
    • https://zapunetiregete.weebly.com/uploads/1/3/5/9/135956705/wabazefav.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/7132070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fd0a0f749fe2.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/jijaxikomuvida_kijoruxuvu_fifujorupavi_rosesawew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_f5be7b0e353d4cc6b98f190e4174a977.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_6039ef3314604d71bb246e85bd328e17.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001850b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1850B 7368 bytes
SHA-256: 059a8145bfb1bcfd42d7b4c224c970866b7a4eaf86590c18dd2d322bb29841eb
font_01_sfnt_off00019dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DCA 5448 bytes
SHA-256: 16124f899c5379af315fd561030f5a2770aae34e222f960a07e5cd8002020da9
font_02_sfnt_off0001b052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B052 11876 bytes
SHA-256: 95103c7f0d5ae8d292b6ce5c6fa122ef70488f07823eef9eced5b7068cd21b08