Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a999fa5a99b4c1a…

MALICIOUS

PDF

63.3 KB Created: 2021-02-13 09:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: a3caa6fd998bd3855e71584dfbd5ea24 SHA-1: 373b5700653deeb5c99a1e94c15627673406602c SHA-256: 4a999fa5a99b4c1a88e9797d6d9d0ddc2f358dc3b0657ae0747e085b4090a492
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://yafferge.ru/wix?keyword=s10+window+guide+clips In PDF document text
    • https://cdn.sqhk.co/lewoxiguj/jEVyPjh/shelterlogic_greenhouse_6x8.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/e6shhha/riwugutabaragija.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/Rx5b3jh/60137884036.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/ojejjOw/run_fast_run_far_big_bang_theory.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_5feeef65c92f0.pdfIn PDF document text
    • http://lami-lashes.site/woxuredekezulekusarugikir9tdpb.pdfIn PDF document text
    • https://bafupenog.weebly.com/uploads/1/3/4/1/134131575/tenazaviram-zojutezelapuje-kanisuvadurire-zekoso.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/minegikukovel/national_lgbti_health_alliance_inclusive_language_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/fourth_grade_division_worksheets.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_off0000bd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD87 5324 bytes
SHA-256: c26774261a8ab3269d24bc4ebd3ec8f8dc10a147257dcde13db627a86cb11edc
font_01_sfnt_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 9720 bytes
SHA-256: b6447cd0d83db5ac0a9cb0669d9c41771b6054afc102ff8297b2f4ddea6d1305