Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ff370a1834f5c0…

MALICIOUS

PDF

75.5 KB Created: 2021-04-06 01:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7138087b7b90675ef1ede212505c0e44 SHA-1: 74016b26add735c6917a68792417b3dbb44744ec SHA-256: c7ff370a1834f5c0f0de3598b9a0ce9063ca8662062b1e4f22ba86086526cd44
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 0.9997

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://jumiwimov.ru/strik?utm_term=how+do+i+factory+reset+my+amazon+fire+tablet PDF link annotation
    • http://fezufizibum.mypressonline.com/arkanaut_company.pdfIn PDF document text
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/1679155.pdfIn PDF document text
    • https://kemosufasegu.weebly.com/uploads/1/3/4/3/134348140/ddcdece7101a.pdfIn PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/bizemivowudaxof.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/6jijbje/67233777316.pdfIn PDF document text
    • http://lezirumari.sportsontheweb.net/arduino_mega_2560_pin_mapping.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/bloodletters_and_badmen.pdfIn PDF document text
    • http://hurleyshamburgers.com/90_s_music_grungeoquc1.pdfIn PDF document text
    • http://dikiradojasika.iblogger.org/answers_on_a_postcard_expression.pdfIn PDF document text
    • https://lekolusogi.weebly.com/uploads/1/3/4/3/134365603/7347086.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hVBtjaD/freedom_writers_true_story.pdfIn PDF document text
    • https://rixedevo.weebly.com/uploads/1/3/5/3/135306589/3299fe5a1a.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/90af6cc3d3b86.pdfIn PDF document text
    • http://cardioactiveufficiale.site/epub_format_auf_kindle_lesen6jisy.pdfIn PDF document text
    • http://mozefiri.22web.org/vesazepizovudap.pdfIn PDF document text
    • http://tdsevsvet.ru/45761188932ywa6a.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/mikexazido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beliraguw.onlinewebshop.net/63419576796.pdfIn PDF document text
    • http://tizesabukabel.rf.gd/fujotijebamimemuturi.pdfIn PDF document text
    • http://fijinibegomiba.rf.gd/b._sc_nursing_syllabus.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 5512 bytes
SHA-256: 75f1ef6a943827829022a954ed3ce5bf20054f04ca9531b93ffcb2bb51a910f4
font_01_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 10640 bytes
SHA-256: d3672b466c9254150035ceda83727ab407a56da1c9bffc5454cdb0757d65ad07

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