Malicious PDF — malware analysis report

Static analysis result for SHA-256 3575987736e82511…

MALICIOUS

PDF

83.0 KB Created: 2021-03-22 09:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b65663ea98c3b1fd30fb7fc45836232 SHA-1: 10a46d6b83f305c7960b9e7dc43594cb52e28572 SHA-256: 3575987736e82511a1ac3f0271e840011f9ce151f1ca6b03e4415caaf5c05fb8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, further supporting this. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/aws?utm_term=sunbeam+heated+mattress+pad+f2+error
    • http://creditscorerepair.info/9339611983125q19.pdf
    • http://wazepewazivulil.mywebcommunity.org/wobabenuxasuriwizibowem.pdf
    • http://petersikdar.com/queen_of_the_damned_book_reviewfcsyq.pdf
    • http://lazakefezives.mygamesonline.org/maths_aptitude_test_questions_and_answers.pdf
    • http://ezfix.asia/what_is_the_lowest_calorie_dunkin_donut8p0c0.pdf
    • http://theandyhong.com/488205805726697f.pdf
    • http://predouche.xyz/683927983780etv3.pdf
    • http://wejnpowk.space/singh_is_bling_hd_movie_filmywap8xuhj.pdf
    • https://cdn.sqhk.co/kikolibub/HSwifie/26236020690.pdf
    • http://clobuss.ru/o_pequeno_principe_ingles6uoxt.pdf
    • http://bluebadgeapproval.com/walmart_pre_black_friday_2020_flyercn8zp.pdf
    • https://cdn.sqhk.co/zuzipogowita/geenjja/35063757548.pdf
    • http://amorexpo.com/603022125250v83x.pdf
    • http://meblik.su/calibre_software_user_manualgaw7f.pdf
    • https://cdn.sqhk.co/boxokozofe/iahbije/software_data_cable_app_latest_version.pdf
    • http://muwiduvepobuz.mygamesonline.org/14075296530.pdf
    • http://zugemenelil.medianewsonline.com/3080190104.pdf
    • http://wimesuzajomos.mypressonline.com/dojalulapetizopogetedinom.pdf
    • http://br1.red/35210434621bkhhi.pdf
    • https://cdn.sqhk.co/bojowagawire/ggCiicH/top_gear_top_hatchbacks.pdf
    • http://rusherx.studio/verokigenifitaxuvelndfv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tiredosutozol.atwebpages.com/uba_aptitude_test_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50a.bin
2b964b137566465ce3fec448060d78e590f5f98e175c64a40daf059cb0a6e4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 5460 bytes
font_01_sfnt_off00010757.bin
fb7cf26e42e3ee6a9bafd2d6cb33124c8b31e918401e74e4c2fb7afd0547a5ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 11836 bytes
font_02_sfnt_off00012f81.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F81 4324 bytes

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