Malicious PDF — malware analysis report

Static analysis result for SHA-256 32023725377bd942…

MALICIOUS

PDF

65.9 KB Created: 2020-12-21 20:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9d100124ee9a32a1ed2596ae3288bdbf SHA-1: ecc2d2cbb6d016eb1ee831e3ded6baa9466ec42a SHA-256: 32023725377bd942d05e25d941ebfcc055f2477788f0752cbcaa9396ef6bdde1
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying them as pointing to known malicious redirectors and a link farm hosted on disposable infrastructure. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the sheer volume of suspicious links suggests a campaign to lure users to malicious websites, 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
  • 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/aws?utm_term=bls+training+pdf In PDF document text
    • https://foxodutamawasu.weebly.com/uploads/1/3/4/5/134587344/zelemo-jesumusabebipo-pipaz-bobemixaji.pdfIn PDF document text
    • https://sizasaligibi.weebly.com/uploads/1/3/4/5/134506534/383e643b.pdfIn PDF document text
    • https://raxisova.weebly.com/uploads/1/3/4/4/134494277/c76a91da5766643.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fccc8ba8afc4.pdfIn PDF document text
    • https://mibaxezaju.weebly.com/uploads/1/3/4/6/134641270/mosalafe.pdfIn PDF document text
    • https://foravozivosuwu.weebly.com/uploads/1/3/4/0/134042788/3388177.pdfIn PDF document text
    • https://joxiwawetesamiv.weebly.com/uploads/1/3/4/3/134306419/b295b9.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdc7d509de11a3bcb749b5f/t/5fdcd36fd6cc4a411d6ae99a/1608307578714/loan_agreement_format.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe01bdbc819f1cf49f1921/1606287806162/bodawozobesa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf516661e25426e12f4882/1606373736333/ralaxubuparazogivuwuwu.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_off0000c95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95F 5260 bytes
SHA-256: d59905ac57c195420e71b28819ba2151995a3d7099929dded10306e23a237775
font_01_sfnt_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 9356 bytes
SHA-256: 1e5705b8266ec95725e956c2b675dfb94c2d6008744b7cac66ee14c5b2f77c1d

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