Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8aa88ec355c19c7…

MALICIOUS

PDF

80.8 KB Created: 2021-02-13 10:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bef1e94763703977e50b16d66325a554 SHA-1: 896972c5550ca87b6b6df7e7cd68c4311bd0a3d5 SHA-256: b8aa88ec355c19c7a0cc08031c32e44574b5f203b446e633c165e3b8f3808acb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of many external links on disposable hosting suggests a campaign to generate traffic or distribute malware.

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://bologen.ru/wix?keyword=paul+lynde+halloween+special PDF link annotation
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/pizisadopowu.pdfIn PDF document text
    • https://gudifikopar.weebly.com/uploads/1/3/4/6/134627505/9976987.pdfIn PDF document text
    • http://gojuvop.iblogger.org/argo_movie_hdpopcorn.pdfIn PDF document text
    • http://connexion-amelii.xyz/nupufukgs71.pdfIn PDF document text
    • https://lapaterema.weebly.com/uploads/1/3/5/3/135321282/nelaga-vonesetos.pdfIn PDF document text
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/3567322.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/2007721.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/najimajetidozemave.pdfIn PDF document text
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/5de34ecff4ca43.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/zendesk_guide_searchq1k1n.pdfIn PDF document text
    • https://kunubixofatefif.weebly.com/uploads/1/3/4/0/134096788/gakelozeneteri-domitexadu-feruvi-nuxif.pdfIn PDF document text
    • http://netewe9.xyz/90131973223efvyx.pdfIn PDF document text
    • http://misiliv.66ghz.com/66815429400.pdfIn PDF document text
    • http://nexekeb.iblogger.org/candle_shack_wick_guide.pdfIn PDF document text
    • https://xepidazezupos.weebly.com/uploads/1/3/5/3/135343087/b6c106eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felawikemuda.epizy.com/summoners_war_konamiya_guide.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/arakshaka_gatha.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/speak_now_1_student_book.pdfIn PDF document text
    • http://wuwepapose.epizy.com/hammerson_annual_report_2013.pdfIn PDF document text
    • http://kevakop.epizy.com/sibawudiresu.pdfIn 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_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 5260 bytes
SHA-256: 40509efc18c2c13bc6d235d813e1db6c4185e4267ce41653b71fb14e7b06710b
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 10200 bytes
SHA-256: c151150d8500d6cd5f9e4225043a2f68b8ed86035c82b8095f4615ac30b81ec6

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