Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d4b77fd4d978a1…

MALICIOUS

PDF

84.5 KB Created: 2020-11-17 07:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 107681ef0b8cb3e7a8518a90df03098c SHA-1: d63a3dadaab94627f3a3cf39c886af78409d0856 SHA-256: 31d4b77fd4d978a1017fde925982c711a71a1c8f7bb6524bfc27260c9568a356
156 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 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=craftsman+laser+trac+table+saw PDF link annotation
    • https://nifubadipapa.weebly.com/uploads/1/3/4/3/134388301/vozoxoraxewol_weratuzuz.pdfIn PDF document text
    • https://zagusopiv.weebly.com/uploads/1/3/4/2/134234894/rexukez.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/2973348.pdfIn PDF document text
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/5566965.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/vuxovemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5fa4b2bce5027.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/8487090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5f992da980a82.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.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/bifamomove/tomb_of_annihilation_4chan.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/gaxujejuginuxidumuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/type_of_gymnastics_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuwaterexaf/st_martin_of_tours_parish_franklin_wi.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/70934895995.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_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 5164 bytes
SHA-256: 4ff5087e665777e91240aa22bfb7144c50d2e8d3bb881fe1584d08511b328da2
font_01_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 11360 bytes
SHA-256: a105ea18a2095a4c1cc8dde8457ee0b2340ffdf4dd94dbdc7b3032909c81da8f

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