Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ca138d2734009c…

MALICIOUS

PDF

66.6 KB Created: 2021-01-26 06:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 141b65c2755252408cba5aa14d9fbded SHA-1: 906a052da7fcebbec771323282d6fa5eb007de28 SHA-256: 74ca138d2734009c687d6ee5ff0d5fb6d25c926297425f695463924ce561ca30
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on disposable domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution.

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.
  • 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://trafffe.ru/123?utm_term=community+member+at+large PDF link annotation
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/josukevix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fcaebd71d363.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/7489975.pdfIn PDF document text
    • https://wewuketis.weebly.com/uploads/1/3/5/3/135327502/wiwiw.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/kopetijor.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/paloxelexexabexiv.pdfIn PDF document text
    • https://kesafukiwunutab.weebly.com/uploads/1/3/4/9/134900694/2522687.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ffe9e83a3eb0.pdfIn PDF document text
    • https://tutamakut.weebly.com/uploads/1/3/0/7/130776204/4179635.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/0016dd5a.pdfIn PDF document text
    • https://mamulexujixi.weebly.com/uploads/1/3/5/3/135390653/zurokulaw_turigovofimezu.pdfIn PDF document text
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/6926873.pdfIn PDF document text
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/f17acac5a.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/divejagezov-tanadusi.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/zefomor.pdfIn PDF document text
    • https://sorafenime.weebly.com/uploads/1/3/4/3/134320910/rutofewim-wojirodatodij-xajumifur.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/werulonob-sudegejikigozeg-zubefawe-devoja.pdfIn PDF document text
    • https://kutepuwabaluv.weebly.com/uploads/1/3/2/6/132681670/288060.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/dupekufilikor_bitefujiki.pdfIn PDF document text
    • https://patoxudiza.weebly.com/uploads/1/3/0/7/130739147/1658508.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_off0000c8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 4976 bytes
SHA-256: 254e42b421843e818df99f289bedf015a3b06e47f59bdcea25f7efaa0313dcd9
font_01_sfnt_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 10432 bytes
SHA-256: 3679433e602946b46a446751ba2b4e13998406995bb724c9389b3aaeea09f36c