Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42b190b01b94354…

MALICIOUS

PDF

77.7 KB Created: 2021-03-24 11:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8757da6562db4526c89d9756f765abd3 SHA-1: 5ef59770c8bd49195c8578c529155ca44814179d SHA-256: c42b190b01b943546683ab1228f114efe9122206111b8966d4c4a7fad2e5e9a0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. It contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. The primary function seems to be acting as a link farm, likely to manipulate search engine results or to distribute additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/award?keyword=cs+lewis+the+problem+of+pain+free+pdf PDF link annotation
    • https://kifobanirijo.weebly.com/uploads/1/3/4/5/134595275/babumuwimokiv-libime-jemavomifedoxu.pdfIn PDF document text
    • https://luloxewawi.weebly.com/uploads/1/3/0/8/130874123/jajomuwe-funaxekisabefok.pdfIn PDF document text
    • http://mexicotop.xyz/13923951417z51qx.pdfIn PDF document text
    • http://train-home.ru/nawetitusonjlw.pdfIn PDF document text
    • http://7lessons.website/cladogram_analysis_worksheet_answer_key380w5.pdfIn PDF document text
    • http://velokir.22web.org/rinnai_hd200e_error_code_11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5fcf473cd42cb.pdfIn PDF document text
    • http://neritam.22web.org/analytical_reasoning_questions_and_answers_with_explanation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_602a165267760.pdfIn PDF document text
    • https://dunexekexafu.weebly.com/uploads/1/3/4/6/134622254/kuzosulirofedif-gujelexat-sebitaf-solafuva.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/8536254469.pdfIn PDF document text
    • http://bodugupuk.22web.org/is_ideallean_protein_good_for_you.pdfIn PDF document text
    • http://tevubirufizibun.iblogger.org/madinawel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fdce359a9656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_6036dde46527c.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/nozuvuxanutiba-lisife-wugipixiver-kotibusilojuri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_c5900175b9ad49198bc5cceafc8d48ae.pdf?index=trueIn PDF document text
    • http://rebokomixuxoj.epizy.com/19622504425.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_de3953a92c224b39ba2274feeed65f2f.pdf?index=trueIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_527ac2453360486aac8825576a530079.pdf?index=trueIn PDF document text
    • http://fujeraxujixu.epizy.com/naxugabonu.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_cc000e936bf54f06ab7671b17de97b0a.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_7b0d3724546f4d3b9b13c9e3c67cfe3b.pdf?index=trueIn 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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 5324 bytes
SHA-256: 5ed96c81badc906896e945bdb5dd764de72f15eec07e9838cdde9425cbfe6460
font_01_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 10040 bytes
SHA-256: d4d583285eb83c2fa0855ba6a4fb50a7dcba4fb8d8aa352186863d1bc4e87263
font_02_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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