Malicious PDF — malware analysis report

Static analysis result for SHA-256 3891a270d12c7725…

MALICIOUS

PDF

71.0 KB Created: 2020-12-15 00:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0c955c1b37bd104aa3de3b665167683d SHA-1: dcdcd6f937fd710456a0c148b569d4fddf0383bb SHA-256: 3891a270d12c7725c2d9813565f731a231b8eb62c06c56ba4c8ee71daa7d8509
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://trafftec.ru/123?utm_term=short+term+causes+of+the+french+and+indian+war PDF link annotation
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/rijuzapapumuwijiri.pdfIn PDF document text
    • https://mivegogoke.weebly.com/uploads/1/3/4/3/134365655/2598502.pdfIn PDF document text
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/pofepumaxis.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/bupig-sudorili.pdfIn PDF document text
    • https://gazerotofutoda.weebly.com/uploads/1/3/4/6/134665132/mimusab_riwuwit_tivivubijijafaj_tikapigul.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/6770233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465145/normal_5fa9600bea4bd.pdfIn PDF document text
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/gowesopugasojaw-tupujo.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/6768288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5fc7e8abd0485.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/rekawexuretowo/donation_receipt_template_microsoft.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_off0000cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 5308 bytes
SHA-256: 309cbf83e42afa80db8e589f6660214f67a4510cafa2d63102bb42ee5ad212e9
font_01_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 10128 bytes
SHA-256: cbd32069074e24074e47185db22f7d0d114e602b5ad02a7026edd16736edfb6f
font_02_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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