Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bd3936d4a7a2c5…

MALICIOUS

PDF

70.0 KB Created: 2021-03-09 16:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: fd9ec9ae7614362ee808f67eb840ffa0 SHA-1: 5845317645a2a49c4c58e75bc7ad2b7517b44d05 SHA-256: 16bd3936d4a7a2c58fcdf4076faeac378c968884dd34b68d7aacb572f82d5542
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lozipotod.ru/award?keyword=auto+repair+shop+invoice+pdf PDF link annotation
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/8593401.pdfIn PDF document text
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/7450214.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/research_design_creswell_citation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/create_online_brochure_from.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/credit_report_dispute_lawyer.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/blank_invitation_template_ks1.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/19709281181.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/zoxisujigijomarule.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/toronto_fun_guide_leisure_swimming.pdfIn PDF document text
    • http://widafasamuj.epizy.com/insulin_sliding_scale_guideline.pdfIn PDF document text
    • http://fuginifetulad.epizy.com/watch_journey_to_the_center_of_the_earth_2_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/list_of_monsters_by_challenge_rating.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/57357342841.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/fejinugizaraweb.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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 5260 bytes
SHA-256: 01acc4d6322238672d0128e7eee502513bc015f0be1b8b8923b85990740da58f
font_01_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 10416 bytes
SHA-256: 3e38aad38b051a2c0d43f6ce2604bc6af4d560803326edda07e4792da8a44ae3