Malicious PDF — malware analysis report

Static analysis result for SHA-256 389e776b2c5f25c1…

MALICIOUS

PDF

75.8 KB Created: 2021-02-28 13:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 492a3a40bcfcfea186e1fb22295cda32 SHA-1: 2ac243aaf5a660d9a3555114fa1db4c2a626c73f SHA-256: 389e776b2c5f25c19ceda61e0582bb9bcf39e26bd0ad1aa88930ce4c465e1690
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm used for SEO manipulation or to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=what+words+start+with+the+greek+root+graph PDF link annotation
    • https://cdn.sqhk.co/bikegola/agdLhjw/zippo_rechargeable_hand_warmer_reviews.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/juvimobivisugub-nijuresexir-vigomavena.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/xixisalakomavezodasir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446633/normal_5ff7d93064871.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/foretoxafalikibip.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/dinarivalajodunu.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/9689737.pdfIn PDF document text
    • https://kixifosesezor.weebly.com/uploads/1/3/3/9/133998007/xefotunupu.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/bje4Xe1/24520466209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476947/normal_6010909613322.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/sisowonu.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/v2jfb56/piano_master_2020_mod_apk_android_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444123/normal_6008f61da9ff5.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/bokaxomodorodak.pdfIn PDF document text
    • https://paluwewokob.weebly.com/uploads/1/3/2/7/132712057/479ab1bcf.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/7dff15c2f9159.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/waripabizo.pdfIn PDF document text
    • https://cdn.sqhk.co/bakavaxa/UVjjy8o/safazoxada.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/pack_n_play_bassinet_assembly.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/tojujamitogabaxu.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/traducir_textos_del_espaol_al_ingles_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/homemade_low_purine_diet_for_dogs.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_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 5356 bytes
SHA-256: c40f23101c0aa8d7a006ec240d18421a5b26b486d9484c6d3b7278dfc34102a4
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 10452 bytes
SHA-256: faecdd23e991d8bddd8254fba51624e8e834f025e63f4424c574434c81064246

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