Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be97391004354a6…

MALICIOUS

PDF

93.0 KB Created: 2021-04-16 19:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1f7bd2cfac0a2da22b9da77c678dd1b7 SHA-1: 80b8f8c49ee46e5edd2c77b78449a2261c4432f7 SHA-256: 9be97391004354a6057f341e690c59a206d8c50fe8f632401acf97698c7bb06a
174 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains multiple heuristics indicating suspicious links, including an invisible link to a domain that is likely used to host malicious content or phishing pages. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/strik?utm_term=redback+jumping+spider+california PDF link annotation
    • http://temppicture.xyz/how_to_program_clicker_garage_openeraddle.pdfIn PDF document text
    • http://dream-stat.ru/32513237144i4nw8.pdfIn PDF document text
    • http://loginwithfb.site/what_is_the_kidnap_command_in_roblox8vp7q.pdfIn PDF document text
    • http://itdiscounts.info/kivutopoxuzanul2g5bt.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/big_sean_bounce_back_instrumentalxc5z1.pdfIn PDF document text
    • http://zarabotok.space/bengali_album_song_siteoz8q0.pdfIn PDF document text
    • http://limaxinsto.xyz/principles_of_foundation_engineering_7th_edition_si_units_solution_manualrlm5g.pdfIn PDF document text
    • http://my-favshope.online/sandwich_definition_memedfx90.pdfIn PDF document text
    • http://gavolav.mywebcommunity.org/etica_aristoteles_livro.pdfIn PDF document text
    • http://vnds-v.website/formel_til_areal_av_sirkelsmf73.pdfIn PDF document text
    • http://cpatrump.com/ielts_book_6_test_3_answersgyfa6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fumidafowinub.epizy.com/el_hobbit_libro_espaol.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/71039466988.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/morethan_pet_insurance_continuation_claim_form.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/the_road_less_traveled_ebook.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/spelling_bee_words_list_for_grade_1.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/41880467896.pdfIn PDF document text
    • http://lironif.epizy.com/gimumawowasonofe.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/python_interview_questions_and_answers_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/xosiwaxelixabok.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_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 5760 bytes
SHA-256: 99575513874ed5c828e048bc50b8ee128b0b83c982394c05244111f1bda53ee3
font_01_sfnt_off00013bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 12024 bytes
SHA-256: 48de1594e65f74eb7988fbc15ca32021077ab1d21cf8365da18c6bde9a531902

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