Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df9681a99be62d2…

MALICIOUS

PDF

83.8 KB Created: 2021-03-30 19:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e10432148f5175690be111ab544aed2d SHA-1: 2c67dca6d8c67899b53feca726842d4294313018 SHA-256: 7df9681a99be62d20daa1dfe4dd496fe089c8bd6c1ad380e67859d272974d0ee
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=the+story+and+its+writer+10th+edition+pdf+free PDF link annotation
    • https://tuzupenaxu.weebly.com/uploads/1/3/1/4/131454165/2358753.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/cbe0714587.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392453/normal_5ff49bb294051.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/kajoxokale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5ff51cb2c7ee0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5ff03decb3045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5fe098a03b808.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/1252308.pdfIn PDF document text
    • https://pazaduzot.weebly.com/uploads/1/3/4/4/134473777/zolejukuba-xufotezepuko-sasosuxatadobux.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/rovuweraja/how_to_pair_altec_lansing_mini_h20_speaker.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/84061631479.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/zubugalikofomaz.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/phet_vectors_simulations_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/81345670748.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/weekly_planner_with_time_slots_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/number_theory_burton.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 5432 bytes
SHA-256: d68a51e1c928a0d9c773864e67e6518e37637eeb0d62057894bebd567a04bb45
font_01_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 11936 bytes
SHA-256: 28c1eaf332129352cd36c6991c40d81b894484b959a22d511d5ec99a8ae0b121
font_02_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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