Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39bd138b8016aca…

MALICIOUS

PDF

78.7 KB Created: 2021-03-17 02:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e15aa634b131fc65d5f101c4d17a4b58 SHA-1: fc9ebccae13b5237085cdf2e2da934869dc66ac6 SHA-256: b39bd138b8016aca0c23530d9286a91668b97aa12d77c97c03a9ef50d2a68b9b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or SEO spam campaign designed to drive traffic to malicious sites. The primary URL, https://mezovuduw.ru/strik, is likely used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=can+apple+cider+vinegar+make+your+teeth+yellow PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fe24adca38aa.pdfIn PDF document text
    • https://zulazuxalumino.weebly.com/uploads/1/3/1/6/131606396/boneguba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_5fe6261b48b61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_6010003a00486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_602fdc6d34f9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_6004ff11885f1.pdfIn PDF document text
    • https://sinemitivivofa.weebly.com/uploads/1/3/0/7/130740142/dirasipil_tusadodesefafib.pdfIn PDF document text
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/jizalagugur-xejivi.pdfIn PDF document text
    • https://sudegefaxir.weebly.com/uploads/1/3/5/3/135323135/d03b361ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463533/normal_5ffb613caeb92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_60158adab2bb4.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/289591.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/4727842.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/livivuvuwugeb/blw_alimentao.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_066ef916236d473c9351128451d90730.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/dukewasepubuvugupemu.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a4c180bbc758433b88aee4e6c1e0f41a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dezajok/sta_rite_pool_pump_maintenance.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/xbox_video_player_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/bijuzaxigu.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_dd5a44fda0e74b77a2362f34f0d229e4.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_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 5532 bytes
SHA-256: 121fbd6582f0fcc886e91256215568ad9609813628d42548233c1fbf8cc1f046
font_01_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 10936 bytes
SHA-256: b5617c9542556f4662f4680df98ae6b93ccacd6e9e3901370258dc7a900ec3d9

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