Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41b2d4e95c80bb9…

MALICIOUS

PDF

77.2 KB Created: 2021-03-03 18:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8364c9776b639b833bce5cff3392b908 SHA-1: 23c3722e5478cc36bad473d3e10a533f996799f4 SHA-256: c41b2d4e95c80bb970d7567e7bcbb9e77348505c6e93ac074209036b334ed016
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to external sites. The presence of numerous links and disposable hosting suggests a link farm or phishing 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://xajibur.ru/award?keyword=how+to+hard+reset+moto+e5+go PDF link annotation
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/197d0089d2e.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/jgheZgg/blue_bloods_season_11_episodes.pdfIn PDF document text
    • https://cdn.sqhk.co/bisozowinala/gejghgJ/tatipomor.pdfIn PDF document text
    • http://saudiautoinsurance.com/basic_calculus_grade_12_textbookyt2ur.pdfIn PDF document text
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/c251160e07.pdfIn PDF document text
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/8864421.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/6gfJgcR/flutter_starlight_lunar_moths.pdfIn PDF document text
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/5990693.pdfIn PDF document text
    • http://mbfsopg.com/william_faulkner_novels_in_orderrokqn.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/jjj7iff/tapovuwisaron.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/8127449.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/what_is_long_term_basis_reported_to_irs.pdfIn PDF document text
    • http://fabikaj.iblogger.org/pinafenilap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xewaxal.epizy.com/39605718763.pdfIn PDF document text
    • http://kazixovo.rf.gd/clinical_trials_powerpoint_templates.pdfIn PDF document text
    • http://gebesetumanime.epizy.com/quotation_reply_email_template.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/nvidia_tegra_tx2_datasheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 5016 bytes
SHA-256: 0ac48e08408fb3542a9c6ba20dd4f7779194adc01e85356357a2c0f99699c6c7
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 10472 bytes
SHA-256: dc9bcaabb9f1b0d48fcc34167152c973060b532b90758fe8ec95c7919877e184
font_02_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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