Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a393c9d2b52322d…

MALICIOUS

PDF

73.3 KB Created: 2021-03-08 09:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 97155427df98bbe959997571d8653712 SHA-1: b4fc7a0f83984ef3806def49569bbaac540de02a SHA-256: 7a393c9d2b52322d3ade08855044251e397d8cd335fa11cbcbbf4691601b2aa7
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+to+evaluate+a+book+of+business In PDF document text
    • https://lidaleteso.weebly.com/uploads/1/3/4/0/134017218/donovewepiwede.pdfIn PDF document text
    • https://jokozoxusatolof.weebly.com/uploads/1/3/1/0/131070378/juzipom.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/zifutawozozo_somuzuwake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_601b08c373e64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380539/normal_5fe0b5cedaac0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367656/normal_5ffec0ae9f62e.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/0f4ce40e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_602d08dc243f8.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/993372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_603c247ad46c7.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/zuwosil/free_amos_16_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/56232411200.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/xinevopigaxosigekavimodu.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/pudozoxutokikuxavato.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/free_bootstrap_templates_for_cv.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/zudigatenewonijomuge.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/89880109595.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/gurikunejajafi.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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 4984 bytes
SHA-256: b8cfba2ce72998274a18c7ff9a54d0b5d9c8a9e42e864e17dfa1630c27501c38
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 10612 bytes
SHA-256: 3d0e39cf230ba0a30b3ccdf63cb1f2299c9365520361f14fd14293ae6428c250