Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75790da9cd8feab…

MALICIOUS

PDF

74.2 KB Created: 2021-06-11 13:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: daf3cf03e00ff408b9b4c876da7f4329 SHA-1: 0598b2d9de6cb8277e75f2806b95187bdd28b29d SHA-256: d75790da9cd8feabde3f7b10d6cb9e15f9aa71e38000de3014e3ed97e600b0c1
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 hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/pbw?utm_term=grade+8+bedmas+questions PDF link annotation
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/2557266.pdfIn PDF document text
    • https://vewagabijepafin.weebly.com/uploads/1/3/5/3/135348553/dorutanogo_xazegasobubudid_gipabu_rapijot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_6031f7438ed86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5fcbd0af3a260.pdfIn PDF document text
    • https://vijosiza.weebly.com/uploads/1/3/4/7/134746498/3624051.pdfIn PDF document text
    • https://zunijitulizi.weebly.com/uploads/1/3/5/3/135305500/98aab0e.pdfIn PDF document text
    • https://gurogujanesoxub.weebly.com/uploads/1/3/4/5/134506981/4580097.pdfIn PDF document text
    • https://gubotejulide.weebly.com/uploads/1/3/4/3/134380330/961c9880.pdfIn PDF document text
    • https://wojawiso.weebly.com/uploads/1/3/0/8/130813991/desuluxatiteber-vavotivewumuxu-jopazilubewinex.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/rupexiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc309ca7-a99a-438e-90a3-cd3fdaabfa41/91562017526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14aa0069-d5a0-428b-bbbb-e90860d1d1d6/93352187687.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/aimbot_free_fire_ios.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144426900/ravaxa.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/gotranscript_quiz_answers_2021.pdfIn PDF document text
    • http://lipadune.pbworks.com/f/is_there_an_app_that_can_monitor_blood_pressure.pdfIn PDF document text
    • http://katafuzum.pbworks.com/f/comprehension_passage_for_primary_5.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_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 5432 bytes
SHA-256: 7b165190902813579e72a33c610a9e2ab9646bec3f848a104dfbd4cdaefcf0a7
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 11388 bytes
SHA-256: f73b15abe38521e2737219d62072361635e6b8589779d891e021a1d0e34f4756

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