Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a4db916166af8d…

MALICIOUS

PDF

63.0 KB Created: 2020-12-19 18:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: db343f6b75b6a00c2c5bf67e97e5b1f2 SHA-1: 924219b2912d245e65ea4b929bcf3c1e40b45ccd SHA-256: a0a4db916166af8d2735a13b79246362ee6c8d9ae0afbf3f56d5d62abbad6423
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 identified as malicious by multiple heuristics and an ML classifier. It contains a large number of embedded external links, a common technique for SEO manipulation or directing users to phishing sites. The primary malicious URL identified is trafftec.ru, which is likely part of a link farm or phishing campaign.

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://trafftec.ru/strik?utm_term=jenna+jamison+nude PDF link annotation
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/rudedoto.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/9288687.pdfIn PDF document text
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/e2e0ce3.pdfIn PDF document text
    • https://jafadunew.weebly.com/uploads/1/3/4/6/134632108/8774195.pdfIn PDF document text
    • https://napemoxirakula.weebly.com/uploads/1/3/4/6/134682748/837907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_5fb4cb21dd4e3.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/771d2760362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d6a334-2529-40d3-b560-87d31e3dc941/duvufusikoxamonajami.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/musejisoxidamoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc255d40-38fa-4e35-966e-2eb6d5cbaf45/fruit_ninja_unblocked_76.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/king_platform_bed_no_box_spring.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd4eb90ef19f7684fcfadb/1606241977544/convertir_ml_a_gramos_aceite.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/gabaperabudetijodimufexeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/carbon_footprint_activity.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/river_rock_fireplace_diy.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_off0000babf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABF 4908 bytes
SHA-256: 83f6dde1f79365af1cab36b5107359ec4fd96cc2971ee1417fbfe33f2fb7b352
font_01_sfnt_off0000cb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 10544 bytes
SHA-256: db7aaa61642b25b9439ebaa924f45749027914dbc01766fb77ea51ddcf1936a5

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