Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7f4a6dfa47af43…

MALICIOUS

PDF

90.1 KB Created: 2021-04-01 21:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 53be569b9f93199d1c8f8bb786365f69 SHA-1: 2c0fcb7234e588f917cd3eb21cd9e4237076db2a SHA-256: ee7f4a6dfa47af438a4d6ce276d6a379ca37a34abf6bb1f51efb200c23c39b98
244 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting or known malicious redirectors. The heuristic firings indicate it is a link farm designed to direct users to malicious infrastructure, specifically mentioning a link to 'yafferge.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=paramount+bank+reasoning+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_604fe035ef2ea.pdfIn PDF document text
    • http://xtrading.buzz/rusabodekujogamalemlt6g9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_602be59d62176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_603ca8be50ce1.pdfIn PDF document text
    • http://itfamily.info/dusuxepubofabapeidozd.pdfIn PDF document text
    • http://milanomoda-italy.site/ktm_1290_adventure_service_manual3kudy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5ff76ac099395.pdfIn PDF document text
    • http://timecodes.net/japitatogovojilozufegtdbuh.pdfIn PDF document text
    • http://allieshouseofhope.com/formal_word_for_good_vibesjvan1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5fd6e0524db0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_6017176e42e90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5fce07ff08b65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a81f9f4-0cc1-4453-9a87-2b9b82aaa21a/best_way_to_answer_behavioral_based_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0259f048-6486-48a6-80c2-c215773c83d9/dapajituw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b56916e-68fa-47af-8bd2-05cb2e225d89/68157947998.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_85b4b0958edc41ab8d2e257f17017c32.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_cd686a01e36d43e691da94e325fe12e9.pdf?index=trueIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_3699026febf2413ea8799fda8fdef084.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b0cf54-c775-4638-b0b5-9e5b5a19335e/molined.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d0725e-fcd5-48f5-b7fe-1c3b716916b8/pathfinder_life_science_books_free_download_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82da1e9-b11f-4a8c-92df-448fd2898bd8/resistance_band_exercises_for_arms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a535c0-af3a-4a1e-ab48-600a734ad183/what_is_better_for_period_cramps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ef1698-a99b-4b00-8eb9-c89a3f70df44/perifaje.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 5536 bytes
SHA-256: e37d3a359b980e5d16efcef6ef53d1865513de827156c1f6343ba169eca11bf9
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 10672 bytes
SHA-256: f993f358eca707fa628727fbeb205c0c7807f4947b50da32e451adf8f2d0ddb6
font_02_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 14920 bytes
SHA-256: c1960dd7c2675f9fcd17f3ad75bde54e5964354b024fe382d148ba4b26d50047