Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3851f48427ac45…

MALICIOUS

PDF

77.5 KB Created: 2021-03-28 04:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: af9f262e7fbe9802b1e7dd6a2a0494fe SHA-1: d30bd1593536ce76a8d653c37759e5e8fcb670ac SHA-256: 5f3851f48427ac45a26ef86e25ac4bc099a81d00f4c1ce8220d586fa1dbda202
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to potentially malicious or unwanted content hosted externally.

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://seumenha.ru/award?keyword=sejda+reorder+pdf PDF link annotation
    • https://dililoperajat.weebly.com/uploads/1/3/4/6/134631443/46aa0.pdfIn PDF document text
    • http://linza.media/686145274049il4r.pdfIn PDF document text
    • http://2022god.com/kindle_app_will_not_booksm58ou.pdfIn PDF document text
    • http://yarrebitteh.online/mixer_behringer_xenyx_1202_review5g2p9.pdfIn PDF document text
    • https://samalatedagunir.weebly.com/uploads/1/3/4/0/134040677/2580915.pdfIn PDF document text
    • http://waniruraguxi.22web.org/boards_and_beyond_promo_code_2021.pdfIn PDF document text
    • http://tublitalia.space/fractured_space_ships_guideo9dt7.pdfIn PDF document text
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/5466393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jonivobo.rf.gd/anatomie_appareil_digestif.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_f61d3e5c646a4b1d97b104d1d7a18579.pdf?index=trueIn PDF document text
    • http://xesijapapun.rf.gd/7935678693.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/craft_cms_3_404_template.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_e620619be8f848279d35f032177f9513.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_4da86985388c4b2aa227965558d48cff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/23306862772.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_e71d5b697c824a54bef6874e02598c29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bivanud/mekexurapukuzokoxukafosa.pdfIn PDF document text
    • http://wakedozalol.rf.gd/support.nintendo.com.error_code_51099_dsi.pdfIn PDF document text
    • http://lofadezowudekeg.epizy.com/84148980276.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_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 5004 bytes
SHA-256: 1bbca305905575437b617dec032119fc2b703624bba0c5433178064693b05942
font_01_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 11108 bytes
SHA-256: 3edc50b997cbbaf72400458fbc35d78bde099bd1c457ce1eef13869cfb1260e9

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