Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbd0546f9dc4710…

MALICIOUS

PDF

79.4 KB Created: 2021-02-14 15:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a896827af6fc08249c23a340ab8526ed SHA-1: 203710ec7b80a0dd93ee3777ef3b3aef3e2b0423 SHA-256: 5fbd0546f9dc47108a51cd0010f45408a3a48db270322d6ced842b178a37d2aa
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a malicious redirector and part of a link farm, with one primary URL leading to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to a download guide, aligning with the 'SE_INVOICE_LURE' heuristic. The ML classifier strongly flags this PDF as malicious, and ClamAV confirms detection as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/123?utm_term=dish+program+guide+won%2527t+download In PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/riniw.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/ghaulhh/74730202218.pdfIn PDF document text
    • https://cdn.sqhk.co/porodiwaten/cJX0uvZ/paxugi.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/aghQgc5/gun_strike_zombie_mod_apk.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/f660bab80c034aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_600aa72895a89.pdfIn PDF document text
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/8846486.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/gigjjbT/12934488393.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/9f6a875dc065c9b.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/bivanud/5572147401.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/minecraft_game_free_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/nature_photo_editor_background_changer_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/xazuxun.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/alien_shooter_2_conscription_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/rch_guidelines_cow_s_milk_protein_intolerance.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/fudepeginasomatewabo.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/xukonatudo.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/gastroenteritis_viral_adultos.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_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 5496 bytes
SHA-256: 7402031d673b32221775b25cd35b025edaa586ca3486a3a7699f094bedc7485d
font_01_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 10456 bytes
SHA-256: 6b3c7ff59fff869ac39a2896729d044bb2c479b28661f459a38b69322ad1f9e5

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