Malicious PDF — malware analysis report

Static analysis result for SHA-256 486fb64c655f7200…

MALICIOUS

PDF

90.2 KB Created: 2021-01-25 08:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8175071b038540e4484e4927a5b783d4 SHA-1: e2edfa1f65187297fb8aeac529656e722ccde5fc SHA-256: 486fb64c655f7200e8d10aa43bc7b8058f00a94ba60295e448c6beb399215286
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with the primary malicious URL being traffnew.ru. This suggests an attempt to redirect users to potentially harmful content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=actors+from+texas+tech PDF link annotation
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/277408.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/jFhj5Pb/nepiviwisedibapeju.pdfIn PDF document text
    • https://cdn.sqhk.co/dalogunutixo/Xnggphc/gorunetodozajuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5ffd6b0334f6a.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/bd0da969aea1035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443337/normal_600150fd95eac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5fdfa97fedd52.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/faxaxos/66697611820.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/puwelubamagetepomo.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/zifameparipududokega.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/tefodikipuvivipemakar.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/free_loan_agreement_template_microsoft_word_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/gevekerivepotonafa.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/bunotixalotese.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/atenolol_50_mg_tablets_drug_information.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/vozenomudozimiwizu.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_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 5148 bytes
SHA-256: 981955db34950788b16f7b1b30ea1ae7a9097d807eeda48106286104c79b7fb7
font_01_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 11936 bytes
SHA-256: 23dd7c5fd85b60d888bc7744f8fa0fe3f88adc927050266c184a385be9adeb75

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