Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44719ac182339d7…

MALICIOUS

PDF

78.9 KB Created: 2021-02-21 05:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dbda846c342fcbeaafd3162c0eba3a9e SHA-1: 8d9306f73fd9ecc492fc18033f84447cff0110b3 SHA-256: b44719ac182339d711026c6382fb63ea2c82dcbe77191728e782eaee8b7f80f5
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 a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

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/123?utm_term=pl-sql+if-then-else+in+select+statement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd638cd77225.pdfIn PDF document text
    • http://study-english-05.site/miracle_morning_affirmations_formulad39dt.pdfIn PDF document text
    • http://sodaapp.pro/94407263983p1og8.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/jvjgiiG/magic_tiles_piano_despacito.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/4491962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fee852443573.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/jFia6ad/73061135204.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/jcigahg/31272569173.pdfIn PDF document text
    • https://cdn.sqhk.co/dedatemaran/cru8Zgd/vizonod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_5fde6a3552137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_6022d8cd88a3e.pdfIn PDF document text
    • http://my-favshope.online/veripizuburozautesz.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/hbGvCgh/pandora_s_box_6_game_console.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dezoruxeg.epizy.com/template_of_letter_p.pdfIn PDF document text
    • http://mujasanowagug.epizy.com/5297342934.pdfIn PDF document text
    • http://zuronixo.rf.gd/lulu_ad_guide_s8.pdfIn PDF document text
    • http://dawivek.rf.gd/19576390814.pdfIn PDF document text
    • http://xevivalekivo.epizy.com/mugikufawakasilaxojelipa.pdfIn PDF document text
    • http://bedigetulo.epizy.com/45940612327.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_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 5184 bytes
SHA-256: 2182979114a2ba2e070a876f1985082e0ea42dae2a8dce0050ca79e15b2c85b8
font_01_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 11536 bytes
SHA-256: d72391ef7f40ca010151df06629679f0251e1aeb5706dc6115e9fe78ea56f6d4

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