Malicious PDF — malware analysis report

Static analysis result for SHA-256 739f3cfb932cddc2…

MALICIOUS

PDF

68.4 KB Created: 2020-11-09 21:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 99feaa547dbd224fdfcbccdfbc6ded2d SHA-1: 7a6a1de243e6ca3fb8ece24490c96fbe6a83b597 SHA-256: 739f3cfb932cddc2c7d721b47ea0bd704523361e8920fe47c8eed738ba9651ea
254 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
  • 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://traffine.ru/aws?keyword=ne+department+of+ed In PDF document text
    • https://poxusesemeli.weebly.com/uploads/1/3/4/4/134462398/gitob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f874c1d7fd5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5f926558b1c15.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/mogepizipiporukam.pdfIn PDF document text
    • https://jokonufukitis.weebly.com/uploads/1/3/4/3/134399540/1757213.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/patinogejitev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f8756cd43fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f991412ca3eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_5f967b1328d10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ratixifo/60611184526.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/black_and_white_books_decor.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/what_does_wida_stand_for.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/bpsc_pre_syllabus_2019_in_hindi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 4684 bytes
SHA-256: 232fd38bd714da818dc377a1f20d511696c4eb7998df6ad3519dceb08e25742c
font_01_sfnt_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 10352 bytes
SHA-256: 4326f2b428e93725c413d41fa76f8a8e2ed6776daed890553a7b2f82f63958c9
font_02_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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