Malicious PDF — malware analysis report

Static analysis result for SHA-256 65371792189b7273…

MALICIOUS

PDF

71.8 KB Created: 2020-12-16 21:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 38b60c8d52bcee11dcc6ac3dad8f9f15 SHA-1: d96004c09c8491ef8a745499967ce84bdf0b5798 SHA-256: 65371792189b7273aa59874c1e5d64fe013cfaf0c4f8a016f923895529b1ff88
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 by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and appears to be a lure related to 'advanced thermodynamics nptel pdf'. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=advanced+thermodynamics+nptel+pdf PDF link annotation
    • https://verosogoteri.weebly.com/uploads/1/3/4/7/134738646/xubefipe.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/nifutil-firiwa.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdfIn PDF document text
    • https://miwunukeje.weebly.com/uploads/1/3/4/5/134524605/libejaguti_gifaxotuladuvok.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/zaduxu.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/b20b9407-fd97-491d-861b-b3b7f56f4961/double_displacement_reaction_description.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/wurizimaletikujaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9629229f-d81f-4499-a9cb-7dac664fd0e7/32815988044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfdddfe-db82-44d2-b0a9-db477de4e919/uf_baseball_field_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23a88f7-47ad-4931-b75f-3dd087f06161/jumewevatuti.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/letters_with_pictures_in_them.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/viganofuvaruzuxo.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_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 5548 bytes
SHA-256: 522cd81bc72fd27c49369722068d9d61447f8e527f2ecac96ab230f4bffd5933
font_01_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 11508 bytes
SHA-256: a1f16cd93dbbeff451f3f6573f1fb8ec39bb83268ce242984776a3b6eaac28e8

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