Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6814b264ae50912…

MALICIOUS

PDF

111.9 KB Created: 2021-03-17 03:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5fdf0bed925fd35b1d9cdd5ca2d8f39c SHA-1: 0e353debd011cd471a8581bc608252cf2a243493 SHA-256: f6814b264ae5091288bb75c84dcae8a3b7744a657e0ba1e72e4a7816dcedec7b
126 Risk Score

Malware Insights

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

The file is a PDF document that contains embedded URLs, one of which points to a suspicious domain ('seumenha.ru') and is flagged as external. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically identifying it as a phishing or trojan variant. The document body, though heavily obfuscated, appears to contain text related to research methods, suggesting a lure to disguise the malicious intent.

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://seumenha.ru/strik?utm_term=grounded+theory+different+from+other+qualitative+research+methods PDF link annotation
    • http://ruwaxidalemib.iblogger.org/84437413091.pdfIn PDF document text
    • https://fizabogozof.weebly.com/uploads/1/3/2/8/132815807/nibilikuwus-xorimemevaza.pdfIn PDF document text
    • http://rifepijogen.iblogger.org/pharmacotherapy_a_pathophysiologic_approach_9th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5fd8528e8263a.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/dukamojan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5fc7289b4916b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476437/normal_5ff2d346a82fb.pdfIn PDF document text
    • https://pufotesur.weebly.com/uploads/1/3/1/3/131378771/lupoxizip-rarorevupinitew.pdfIn PDF document text
    • https://nerutaraludu.weebly.com/uploads/1/3/4/6/134672403/duzonurufun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_601e230925d34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fe0fbfa36838.pdfIn PDF document text
    • https://gumoxeladupeguv.weebly.com/uploads/1/3/4/3/134318886/9889266.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/wokesabisevo/john_deere_265_mower_deck_lift_linkage.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/74568236108.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/chahun_main_ya_na_female_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9f1021-b7e6-468f-b15c-c54c93629652/nudokinomofus.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/5272640517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea51409-e4af-4251-814f-fb0efc0a42de/34610466748.pdfIn PDF document text
    • http://jabenesejamuji.rf.gd/jupigopodoxizirukusoni.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_off000177b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B6 5580 bytes
SHA-256: 1fdbfbe033f7465ca9ec07121409993d6e985593294d26194d32b1b9cc9cfddd
font_01_sfnt_off00018a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A97 11880 bytes
SHA-256: 988c64493f26709a5e07e0289171fbf61531c11a2229b6c28c3e6d92cb0ce01c

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