Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a7fedf0d6b4d58…

MALICIOUS

PDF

90.8 KB Created: 2020-11-14 09:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d513c8576067e0b82eebef6a24a1172b SHA-1: 17629f258d7272097949c64f3da6d51f0d339e81 SHA-256: b2a7fedf0d6b4d58dd6f465b2d20781caaf2f02c963985b67c14e565cbd06f85
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 a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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/aws?utm_term=studies+about+absenteeism+in+the+philippines+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448991/normal_5fae1f0fe4b10.pdfIn PDF document text
    • https://rebuxikaxaj.weebly.com/uploads/1/3/4/6/134668288/215158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_5fa61875bc4b7.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/3803396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_5f99407c5b813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5f97527996ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5f9a4046c3018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8822f85a3e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f87c7d65851b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5f9cb6519fd4c.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/taturi/the_trials_of_apollo_book_3_reading_studios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a89cc92-2f5e-4e02-ab50-5c519779f4a1/11480326112.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/zuzogabileborebojal.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_off0001264d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264D 5428 bytes
SHA-256: 4a0cbf74eeb8a6e86025fc4083a1d0b125cecac6578ab77413f1047896cd58d7
font_01_sfnt_off00013899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13899 11040 bytes
SHA-256: 4622f98a2ab51af981cac2626f3a8d852a6eb7d668eaa57272d758c877a09d53

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