Malicious PDF — malware analysis report

Static analysis result for SHA-256 377c4cf3ba49e4a6…

MALICIOUS

PDF

68.8 KB Created: 2021-02-25 09:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 2e39be07678297e8e441d000ddfff86a SHA-1: 5bf5c92807b8c1e3e837b9ddd105f74f3b3e509e SHA-256: 377c4cf3ba49e4a6dfad8676c257c2dad1f9605e5cb817ab2edb33781f085448
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://maypoin.ru/award?keyword=thinkpad+t430+price+philippines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5fd7a5be9352f.pdfIn PDF document text
    • https://topudamix.weebly.com/uploads/1/3/4/5/134581811/gexikugimoji.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/fjhjfgf/topalemadekawimirujuzuk.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/a47hbhb/3663928193.pdfIn PDF document text
    • http://junelizirigoroj.iblogger.org/banshee_performance_parts_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/idhahit/ribanufenitawomirubunir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5ff6762673abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_60325d6bab39d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_601ffdbbd7bdb.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/Mcia9hg/walmart_weekly_ads_tucson_az.pdfIn PDF document text
    • https://tegimawemax.weebly.com/uploads/1/3/1/3/131383609/dinadav_lupasib_vifakupagifomof_xukumoxom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453129/normal_5ffd389478e0e.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/jedobufudajewu/illinois_attorney_client_privilege_former_employee.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_off0000d01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01B 5568 bytes
SHA-256: 6f98d08087252e368e2f0a4c4b51f66c2a56ba4e674a0a7f5078aace8fa3314c
font_01_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 10380 bytes
SHA-256: 5f2c06ecd0395473afe024c220df4729e83d5468ea05629f5cd34bfa660f429f