Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91d661ff38cc3a0…

MALICIOUS

PDF

60.7 KB Created: 2020-11-16 15:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f3f29d44d96baff7e378f15a876667d1 SHA-1: 1b057296427d09bffb7dd67600b0fd46716d6a1e SHA-256: e91d661ff38cc3a0390c99232df151a81acf86506e6488a50701184693d87a21
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other file-hosting services, which is indicative of a link farm designed to distribute content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=identify+the+controls+and+variables+answers PDF link annotation
    • https://waseralubireg.weebly.com/uploads/1/3/4/6/134622629/dcbea86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_5f9fbdac2b4e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_5f8eaf7d8a55f.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7007845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386830/normal_5fad7ae0e46c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5f95245074079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_5fa7e07b03e9f.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/bitajemisajoz/swtor_trooper_vanguard_pvp_6.0.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/aptitude_book_for_bank_exams.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/run_mills_eagles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd99de3-da37-48a9-9491-e9ee119da763/56433811597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d050938-802e-4964-af19-93cf9f7e4a54/28977708485.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/ordinary_people_book.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/timeline_of_volcanism_on_earth_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/priyanka_chopra_jonas_baywatch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd5a4b9-1b31-48ec-9ccd-3d069b05a3a3/umich_hockey_schedule_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/67507229466.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_off0000b21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21E 5440 bytes
SHA-256: 84665715d5eed520c43cbd82d36e41008da254058d5eb1c5e48a12cc1c6729fa
font_01_sfnt_off0000c4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 9644 bytes
SHA-256: dc39f84adb6261f6271387ef20aeade20cc49f412ddd6c4b1cef8ed7733d7744

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