Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73743af1c0b7757…

MALICIOUS

PDF

75.4 KB Created: 2021-03-15 22:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ea6e18e8184eb0e12823128828139747 SHA-1: be32e6365794605ae647b486d80c28064925cfdf SHA-256: f73743af1c0b77574a27fb965a91f2137ee5c827329773ddcce5f3c9219dc0f1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or redirection attack, likely leveraging embedded JavaScript for malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=mobility+allowance+application+form+uk PDF link annotation
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/wagajivogulanotat.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/gd91Tjc/mebutukewodabixefidon.pdfIn PDF document text
    • https://tonofoku.weebly.com/uploads/1/3/4/0/134096462/wunekek_sikuxobisivixum_tuxajubuxo.pdfIn PDF document text
    • https://xodukibefapox.weebly.com/uploads/1/3/0/8/130873769/15b9252df6d043.pdfIn PDF document text
    • https://joxisewegiwazev.weebly.com/uploads/1/3/4/6/134669132/1147070.pdfIn PDF document text
    • https://cdn.sqhk.co/bakebuvig/ghrhaij/1929982706.pdfIn PDF document text
    • https://perasukene.weebly.com/uploads/1/3/4/6/134644841/vokogizifuko-pebokudigabaj-fetafevetakabe-majimimot.pdfIn PDF document text
    • https://zanefasijim.weebly.com/uploads/1/3/5/9/135965469/87f3da77768.pdfIn PDF document text
    • https://pasijafedi.weebly.com/uploads/1/3/4/8/134851145/9f45c73c30ba0e.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/tubukeganuji/vovopor.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/mibasepuvabixivire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814dd2c5-c1a0-4a8f-a142-3f54cd43d752/what_they_dont_teach_you_at_harvard_business_school_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a759b86-f29b-4b54-ae71-5f2a22a9156a/what_questions_to_ask_a_physical_therapist_on_an_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ed45d5-03ac-43fc-8b6a-87260b7538b2/34504566504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c5793d-f0da-44d2-8516-6df45cc3060f/46523178877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb95afb-c425-4b5b-83ea-aad03fe106e0/ps_vita_slim_charger_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e3f59c-a847-4198-a2f8-29f6aa29ef56/31137165711.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/ben_10_2005_tv_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20004ee9-34f7-4721-98da-2a532257bf45/13578388368.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_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 5384 bytes
SHA-256: 97ead4d551adbd86b69f3e55c4a5a0ea87528eb9191c4e40cd5694b22d8e1f7b
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 10360 bytes
SHA-256: 05e15eb2ee9a459b40ac8bd6600fbee27fc1bd3277c74cf725364288302567b2