Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c956d560de2ce2…

MALICIOUS

PDF

70.4 KB Created: 2021-02-14 02:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d1477efe224d9a4b59b14213801ca116 SHA-1: 31e9305b58c734d815add47002de666a235668f4 SHA-256: 55c956d560de2ce28df9e0e324bc8883949432694378ddea0e2aa8b33e0f5ae6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with a primary suspicious URL pointing to 'bologen.ru'. The document body, though heavily obfuscated, suggests a lure related to a 'printable' resource, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=my+teacher+is+a+star+because+printable PDF link annotation
    • https://cdn.sqhk.co/xufatirumina/KjgTsgg/woxuxerujexa.pdfIn PDF document text
    • http://academic-club.ru/367528216615mdej.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/eTlk4r5/contour_next_link_meter_ndc.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/BQjacU4/tovutawuregiture.pdfIn PDF document text
    • https://cdn.sqhk.co/fenajobuwer/hhaNgdB/wunasizir.pdfIn PDF document text
    • http://fresh-ita.fun/ginab12y3b.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/jcgjAhc/36243720027.pdfIn PDF document text
    • http://biomanua.website/11895005373dwdmb.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/pentagon_with_3_equal_sidesrbiz2.pdfIn PDF document text
    • http://meinekarten.best/crossing_field_lyrics_english8bjvj.pdfIn PDF document text
    • http://egosikenclub.com/334437067077cool.pdfIn PDF document text
    • http://odemebayisitrafik.com/aromatic_nucleophilic_substitution_reactionv5tjk.pdfIn PDF document text
    • http://my-favshop.online/guided_sleep_meditation_appt74bm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rumezo/sudafisap.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/espghan_reflux_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/1251972745.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/torupabasologukuzoxizuji.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/dugakewuladepa.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_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 5268 bytes
SHA-256: ef8617b35b11ccb0c6ea660905d3c6ff574c2e44d783f2b67c8f8e77523929c5
font_01_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 10392 bytes
SHA-256: 378f2d28bbcd5390f654bdc1bcea686acfc3604e2ffc49f86fec046276b99ba3

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