Malicious PDF — malware analysis report

Static analysis result for SHA-256 0552fea25f0c0221…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 00:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1d5bcdc0591dbf51080530e0b2bb464c SHA-1: ddd99461d5ee4940e6408c34e64b977480a339c1 SHA-256: 0552fea25f0c022141fc917bfbbbf81e779496c50f60481cf72b37f3ab6f8a75
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and at least one known malicious redirector. This strongly suggests a link farm or phishing campaign designed to drive traffic to malicious sites. The ML classifier and ClamAV detection further support its malicious nature.

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://crophysi.ru/award?keyword=marvelous+designer+7+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_5fdaf0efdb9ce.pdfIn PDF document text
    • http://muldwych.com/bepawadexime8q.pdfIn PDF document text
    • http://am-sound.ru/4259626301akyfl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_6051adc080563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458421/normal_60436088ad61c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401711/normal_60124cb609c8b.pdfIn PDF document text
    • https://duzikasaropofe.weebly.com/uploads/1/3/4/4/134489835/ligasesopozagovuw.pdfIn PDF document text
    • https://nipixosawapur.weebly.com/uploads/1/3/1/1/131164079/birejiditeka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5feb7e5782b15.pdfIn PDF document text
    • http://basvuruizleme.online/74148226907yvavb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_6001fc9764d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_5fd94b7a97687.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5ffc89444e918.pdfIn PDF document text
    • http://topvideo.design/81473885067uus6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_6027c364b1e92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_e9e154ada7f24e39ae467a313037e99e.pdf?index=trueIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_28ed60e3cf9b47769394ab252383307d.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_4c835790275b43bbac2c36fd5369f07a.pdf?index=trueIn PDF document text
    • https://acbe2b0b-ee64-4eea-b0ce-372b1aa9cc7a.filesusr.com/ugd/4bcc67_4ce27ce06afe4859b3a5da696508088d.pdf?index=trueIn 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_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 5504 bytes
SHA-256: ed93eee336b34fad6c744000ce5c2f4697811d7bff556ff55475ae3f48733f17
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 10912 bytes
SHA-256: 3532e4e8cbe1fc4dff07fe9b104cf76d1c8d2affc36df4a1d2170e2d55f71aaa

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