Malicious PDF — malware analysis report

Static analysis result for SHA-256 5389b8bf79604cca…

MALICIOUS

PDF

88.8 KB Created: 2021-04-06 11:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1980602c4ddd9e23d0dac084abddf0b4 SHA-1: 254d9973880baf3d7f78b9ebfdc0ff265b23f8fd SHA-256: 5389b8bf79604cca6203755bdd7d846c6ef582cf9642bdf5d19aa1eb98f8ae8b
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://pelibifir.ru/strik?utm_term=shield+of+aeneas', suggests a phishing or malicious redirection attempt. No scripts were extracted, but the PDF structure and link farm indicate a likely spearphishing attachment used to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=shield+of+aeneas
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/4899065.pdf
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/bosowidetokisuxitupo.pdf
    • http://kevexupivuzovif.iblogger.org/4901776053.pdf
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/4375253.pdf
    • http://ziweninuxepip.iblogger.org/motor_boat_sound_effect_free.pdf
    • https://wowobomufib.weebly.com/uploads/1/3/0/8/130874304/d73e430b.pdf
    • https://bajawefigorega.weebly.com/uploads/1/3/5/3/135339811/kapid.pdf
    • https://reborugavuzak.weebly.com/uploads/1/3/4/7/134736286/1600025.pdf
    • http://dazomasuw.22web.org/sozuzimunaxen.pdf
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/9df3ae8d.pdf
    • https://pufokebisuniga.weebly.com/uploads/1/3/5/3/135324869/toguwonusasas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c9fd070d-2215-4c83-a8c7-d2c33d52ed60/tedexoduw.pdf
    • http://fewuzefar.rf.gd/mujizif.pdf
    • https://uploads.strikinglycdn.com/files/d0acf1a1-1fd1-458c-91f8-397ee744e310/whens_the_next_covid_19_review.pdf
    • http://durevitulo.rf.gd/angulos_en_la_circunferencia_problemas.pdf
    • https://uploads.strikinglycdn.com/files/542b1dd4-8ab6-486e-81f0-e3cd69f84c36/jorubudilitakojin.pdf
    • http://toxiwudogosos.epizy.com/retitibu.pdf
    • http://gosovugan.epizy.com/fivufuminekemube.pdf
    • https://uploads.strikinglycdn.com/files/72d9f1e0-cd21-4743-8e91-8059ffbc3b21/triumph_bonneville_t120_service_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d9d.bin
12df2c2532e457b6d4f60b539e887836219267acb4c69a875942678539bf1316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 5004 bytes
font_01_sfnt_off00012e9f.bin
a0be6fcc4d3f495907a7b9a21efbdb375e928ed0f89c70a3af65e5815c9ee6a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 11248 bytes

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