Malicious PDF — malware analysis report

Static analysis result for SHA-256 398eb493007b9ca1…

MALICIOUS

PDF

76.6 KB Created: 2021-02-18 09:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 449454a4f3f61f011244eb1088d3c67e SHA-1: f77ad4d20186df23b4058ad5c7d0ccca13c76a9f SHA-256: 398eb493007b9ca1a0078ccd806d48b02321e786a08f41f51ff4671d85e61829
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, one of which is a link farm, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to 'football games apk offline', indicating a lure to download potentially harmful software.

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/wix?keyword=football+games+apk+offline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380083/normal_60233e33c2072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470389/normal_5fcc401867831.pdfIn PDF document text
    • https://cdn.sqhk.co/zonurubo/gJgiIgj/zusukuditesar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5fe185f998135.pdfIn PDF document text
    • https://vidafipi.weebly.com/uploads/1/3/1/6/131636743/2d749fcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_5fd0a0fa8a679.pdfIn PDF document text
    • https://wojodusu.weebly.com/uploads/1/3/2/8/132815854/e6da7527.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/fhgihgh/80823764376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_60296080733a5.pdfIn PDF document text
    • https://cdn.sqhk.co/fekolisuzub/Dgdjajj/ocean_dream_ship_itinerary.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/eMrhijR/nifapasuma.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/iehbjaw/sowanefeforup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dulaxidej.epizy.com/saazish_film_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/votaw.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/eye_candy_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/automation_tycoon_game_free.pdfIn PDF document text
    • http://refewededuxita.epizy.com/animal_flip_flop_size_guide.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_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 5284 bytes
SHA-256: 593239dac956093c759ecc08f5583b0c4d448c1b62c7f1cc55e69c7512c75683
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 10332 bytes
SHA-256: f5ec01badc04357e96406e8d6ca2349a2dc0b5a38b5424070a78383fa501e6a6

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