Malicious PDF — malware analysis report

Static analysis result for SHA-256 946cffb1bfae636b…

MALICIOUS

PDF

65.6 KB Created: 2021-01-10 02:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c7a80d5cb85f29c5d54e6c280b7db22a SHA-1: ef9eca8a466775353063572eb6e269956177e495 SHA-256: 946cffb1bfae636b14f1c94ba5a89089ea409d4a0aff99350b762903420d47dc
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to external PDFs hosted on disposable domains, indicating a link farm likely used for SEO manipulation or to distribute malicious content. The presence of a link to known malicious redirector infrastructure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The sample's primary function appears to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=projectile+motion+practice+problems+worksheet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4485162/normal_5ffa14b008d23.pdfIn PDF document text
    • https://finirawex.weebly.com/uploads/1/3/2/7/132741073/4360975.pdfIn PDF document text
    • https://xutonipojoneri.weebly.com/uploads/1/3/4/6/134667901/pujomixabogopena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5fc90fb491754.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/fgfjhXU/xitujakukegonerobizipeta.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/xivitemudigoxi.pdfIn PDF document text
    • https://wezobugedelu.weebly.com/uploads/1/3/1/8/131856743/1e98152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fe78a2d33cf9.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/fmnPsha/super_soccer_champs_2019_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/hiU0haQ/1st_grade_math_problems_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5ff56ac96fd0c.pdfIn PDF document text
    • https://fenagedel.weebly.com/uploads/1/3/4/3/134316540/9403999.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/T1a85ud/bee_pack_tulsa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC221 5548 bytes
SHA-256: 8e6f86c9e4f51aac1957432b9e2b127515e0d56b5b09cb1375215071aa51e5d8
font_01_sfnt_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 10804 bytes
SHA-256: d005a133ee3ebaa328b43b633e1c75d15686d85352e8ba8c27568eb8a8c29156

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