Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c42e9349953506c…

MALICIOUS

PDF

74.9 KB Created: 2021-04-25 22:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2870ffba18a171a0aee5cf92561a8c3f SHA-1: 202157adfafbb301f4ab1a7701ce39a27bc400e1 SHA-256: 6c42e9349953506c180167422a30e3c501065fe6f966f595795429186ac22137
156 Risk Score

Malware Insights

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

The PDF contains heuristics indicating a malformed exploit stream and an embedded URI that functions as an SEO redirector, likely for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains keywords related to car maintenance, suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/strik?utm_term=what+is+the+correct+tire+pressure+for+a+toyota+camry PDF link annotation
    • http://bafakuvim.sportsontheweb.net/20117361422.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/aLgjOjh/gem_hunting_in_north_georgia.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/tabletop_rpg_games_news.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/xjjgilE/cross_bridge_smooth_muscle.pdfIn PDF document text
    • http://gifinibufenatar.medianewsonline.com/zuzovidim.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/biology_reference_books_class_11.pdfIn PDF document text
    • https://cdn.sqhk.co/dodagirojep/XTWjaHX/kenijewejugi.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/CzJvuib/fepekime.pdfIn PDF document text
    • http://wutugidejavazu.scienceontheweb.net/b_tech_cse_course_viva_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekazaz.myartsonline.com/discovering_your_authentic_leadership_hbr.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/is_pellet_stoves_worth_it.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/manually_operated_pipe_bending_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/dutuwexodugugetobatuv.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/fizitamisorulil.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/27835512726.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/50985211264.pdfIn PDF document text
    • http://kipazafar.atwebpages.com/verbos_regulares_en_ingles_tres_tiempos.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/inductive_bible_study_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/canon_pixma_mg2220_installation_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eea373e-1062-4ebd-8ebb-fa88568727e1/riyad_us_saliheen_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ac0721-3b4d-424e-bdea-adc39149e368/how_to_put_decals_on_plastic_models.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a64b007-bccd-4bc8-a1c4-ba0ccdb71ed8/how_to_clean_oster_steamer.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/973520716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80634fe7-b550-46a3-a414-216fd71d8a52/liftmaster_formula_1_not_working.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_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 5336 bytes
SHA-256: 7d56749fff2fd32b35f06fa928909ec7c77c89fc5b06fa41ef404c2366905dba
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10412 bytes
SHA-256: 66b4da4f926c76800515987fe4c98faa4d3dd44adf27e511af7acb23a1fad0e4