Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a71cf583e969c26…

MALICIOUS

PDF

67.1 KB Created: 2021-02-19 12:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8356fd6f9466c1909d4fdca439f19628 SHA-1: c6990c23fc556c3fa0d8119282af159b48dcce09 SHA-256: 9a71cf583e969c26792abff66db66fab1c1877884d438c7ec4597e5cd105cd40
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation and a URL that aligns with the phishing lure.

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://maypoin.ru/strik?utm_term=relative+clauses+rewrite+exercises+pdf+with+answers PDF link annotation
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/6783609.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/c52527bb4616.pdfIn PDF document text
    • http://fertpin.online/assassin_s_creed_pc_game_listii3qu.pdfIn PDF document text
    • http://lamovingcompany.com/scene_definition_literatureyrot1.pdfIn PDF document text
    • https://lisudite.weebly.com/uploads/1/3/2/6/132682892/2663891.pdfIn PDF document text
    • http://esagafow.fun/sonefev7l0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483842/normal_60087bba25acf.pdfIn PDF document text
    • http://dimoduves.22web.org/23910533708.pdfIn PDF document text
    • http://graatorama.space/the_new_urban_sociology_5th_editionj0j75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_6019f5d7b41a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_60112135d32cb.pdfIn PDF document text
    • https://vemakovuzabomon.weebly.com/uploads/1/3/4/8/134881214/671770c2561f048.pdfIn PDF document text
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/ba740.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/radubomorusurosusoba.pdfIn PDF document text
    • http://xanimupa.22web.org/kabagixaguvozogizulubumox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5fd0fb1820235.pdfIn PDF document text
    • http://tonagruz.ru/b_tech_malayalam_movie_fullmqrxs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegewamofuxa.rf.gd/guided_meditation_for_sleep_app.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/biluradazutizokizu.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_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 5472 bytes
SHA-256: ac650188ebfef61a00bcfa8e89ae5a35408204ac5aa54e95b8a8ad1b266b5d46
font_01_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 10496 bytes
SHA-256: dce86376c65a8300148cb2b061eeb6751aaf821fc7ee8ff7ee648ff667a3a625

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