Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39d66dc24435e20…

MALICIOUS

PDF

83.0 KB Created: 2021-02-27 17:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a680dffe83d99d6a6366664a889aa75b SHA-1: aaf5c97c8aa0ff01259c01d1538ae55d65fec84b SHA-256: c39d66dc24435e20b041840aaba6be6beb6b43e804d465b767b1bad48ba5211b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one pointing to a suspicious domain ('golowaki.ru') that is likely part of a link farm designed to redirect users. The presence of many links on disposable hosting further supports a malicious intent, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=the+bainbridge+mass+spectrometer+shown PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479921/normal_60184cea9e9e6.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/fe6f86bcc0c4ff.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/when_was_the_lenovo_t420_released.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6013ed486dc55.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/zuwujojaxo.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/79462484430.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/what_are_3_workplace_policies_and_procedures_which_relate_to_whs.pdfIn PDF document text
    • http://soxiwokix.iblogger.org/18651775019.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/cuantos_metros_cuadrados_equivale_un_milimetro_cuadrado.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/ford_555d_backhoe_bucket_for_sale.pdfIn PDF document text
    • https://mipopifedaruw.weebly.com/uploads/1/3/4/3/134356442/5083089.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/turn_the_ship_around_david_marquet_audio.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/how_to_reset_a_westinghouse_tv.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/sandisk_clip_sport_firmware_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 5636 bytes
SHA-256: 7564505f493e7f9774e86496f0af02b8fcf4119c857f1c92735208db030e713a
font_01_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 14576 bytes
SHA-256: 0ff3e63fd088217e5fd4f963328a12ef8a47c68617096984922381a91af14990
font_02_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 16112 bytes
SHA-256: 83c8ec52143525ac1de2a12eb37e3b0c7a285a7557193c97ef957095f0a788bf

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