Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f9bc744e82de46…

MALICIOUS

PDF

74.2 KB Created: 2021-05-01 01:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 570716a40dc00860f49e27834ccc0bce SHA-1: 9501bcd2bf1fa768ee788542a611461318e3c29c SHA-256: f8f9bc744e82de468def7bb9f757a1836d351ee91b96eb001b40d1554c82bb9c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a printer service manual, aligning with phishing or malware distribution 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://gimoguvi.ru/strik?utm_term=hp+laserjet+m1536dnf+mfp+service+manual PDF link annotation
    • https://tetiwaxope.weebly.com/uploads/1/3/0/7/130776033/11827becc80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_601224da64386.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/roridokolerewibukuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_602d8055c7bc9.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/jojowuxewaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461219/normal_5ff897131c9db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5feea247acb0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474719/normal_5ff662aa2fb4d.pdfIn PDF document text
    • https://refanise.weebly.com/uploads/1/3/5/3/135389799/vomesus_gegijuredovumi_dosiderej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_6004b73cec12e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_606c61f0b85b8.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/guwufagiwetuk-tosewusenepiwat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5fdecca7ad6a2.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/fosalizuzu/latepudexinojopelaworusu.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_3913fd77ba1c4f1f83cf05e784acb9b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/chamma_chamma_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/marasuletefaxolupizoved.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_8b2129d6eacf4e188ebe26dae53439bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/wj_iv_ol_subtest_descriptions.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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 5892 bytes
SHA-256: 805a9ec9a36b16fb9fce7f5bb6527607b1ba66de176d1ad8dc6a73a2eaa0400f
font_01_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 10912 bytes
SHA-256: c10bb36f07025fa29f0876c27e37c1f7484741c42fa299d6a3a085de24549f43

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