Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d7b84bd5246bf0…

MALICIOUS

PDF

70.4 KB Created: 2020-12-05 23:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 47f7c7d7c42983d34bd38748952f980a SHA-1: 2166e81946992b132ac591d7374b1a947866b51a SHA-256: 52d7b84bd5246bf02a00f1c1e7f3bcf336c011c6b1a50284be249141d7a41cbc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are to other PDF documents, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

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://traffset.ru/aws?utm_term=simple+construction+schedule+template+excel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5fc641724cfeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f8a72d9c1177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fab79c610cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fa1ab5b59ed4.pdfIn PDF document text
    • https://mesedegusi.weebly.com/uploads/1/3/4/6/134600151/09097edc5.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/nozaripivutaxo_zivibemewus_kunapurodizujim_tekoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fbc199bc7cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5f8c448c005f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f871ce95a9ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe07a218e72e5fdb9dcac3/1606289323709/pathfinder_tian_xia_names.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf67f07acac6192ab92b8d/1606379505501/82050092251.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e80068612547ed5e2b99/t/5fc1f9f9145a8629dcf6a347/1606547962335/jasmine_s35_acoustic_guitar_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65baa405d5340f34f03b9/t/5fc8c7a8d32d012678021902/1606993833239/66322836385.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f56dd26ff1194f8deacd/t/5fcb2215b495bd20281c8a90/1607148055107/87284431078.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5700ff7cf8c754049529a/t/5fc5eb74f8cdb769c6b02166/1606806388871/45116804651.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_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 5484 bytes
SHA-256: 3a729952c3abf5a68aa729f213c2762e32b458465efa27d17670c18d0fac8905
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 9996 bytes
SHA-256: b6e6d44db8f3dde260fcf5d4edd745516f69790dca34aa18ca6fffb9d5b0885e

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