Malicious PDF — malware analysis report

Static analysis result for SHA-256 610bb4694720975b…

MALICIOUS

PDF

80.9 KB Created: 2020-11-22 19:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3d64f5c4cc4d8ee0f92979b83a5bd886 SHA-1: ed56c99b6bd782d0d10c6ebdfaed7e9d1be262f4 SHA-256: 610bb4694720975b938bb7c086771b0ba630f6e9e0376402fde4dc4df13d1d80
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 Weebly and S3-hosted PDFs, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/aws?utm_term=agenda+fiscal+2018+pdf+descargar PDF link annotation
    • https://bazotopefinuz.weebly.com/uploads/1/3/4/4/134435952/xoduwokodikitubaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5f9d77d4de095.pdfIn PDF document text
    • https://vijejomikozo.weebly.com/uploads/1/3/4/6/134668467/votubabakovi_wizaxeb_gatakut_kapusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5fa4ad8895d63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5f95ff860a997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5f93419d5add9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5f9c02394dd06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_5fa8c70295e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f8f8d66a777f.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/susonanezaj/metemeleloxixero.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/bontrager_bike_computer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/4869373171.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000da24.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDA24 15780 bytes
SHA-256: d5b4757db2a39795c61c2a56c587cd2cd254fb0bd7cbbd69572fdaa2e9511234
font_00_sfnt_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 5428 bytes
SHA-256: 492235e0258a7fcc04683be6340ccbed6c04686a0de22039cee7a4bccd6419f2
font_02_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 9960 bytes
SHA-256: 4d31197fe13e32e713fc344857d681158c53668557cddb7654c20a31321a68c1
font_03_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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