Malicious PDF — malware analysis report

Static analysis result for SHA-256 b676f850a05eda1e…

MALICIOUS

PDF

74.6 KB Created: 2021-02-23 14:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 38dfe548bc45417d37d8456783ad89a9 SHA-1: 9fbcf96b7931ff4017a2a96d2a66986cb322a774 SHA-256: b676f850a05eda1e34859c2a0223f0c7cd08f1eaf71dd712e9745ab9dc638791
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically as a phishing or trojan delivery vehicle. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=el+mundo+de+sofia+completa+en+espa%25C3%25B1ol PDF link annotation
    • https://kajagutodadu.weebly.com/uploads/1/3/1/4/131437420/bosuk.pdfIn PDF document text
    • https://fojokelimavame.weebly.com/uploads/1/3/4/7/134713907/2ec15.pdfIn PDF document text
    • http://niripat.iblogger.org/canadian_breast_cancer_screening_guidelines_high_risk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5fce09472b223.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/227087.pdfIn PDF document text
    • https://kunefenirubineb.weebly.com/uploads/1/3/0/7/130739500/vogobanuzadif-metevub-runobot-vuwelova.pdfIn 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
    • http://miwofalixi.rf.gd/nelezakeboziwa.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/jukuzodomotumizuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/jitop.pdfIn PDF document text
    • http://tidefos.epizy.com/nadofiraxe.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/35419949219.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/ifrs_deferred_tax_balance_sheet_approach.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 5256 bytes
SHA-256: 6f19a922e1bb9c0cf9111aa91bb25d42b4528fff93abc4ae943ab6c54391eee8
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 11696 bytes
SHA-256: d4a6968c9d5bd307e45b14348050e0b0d0849793496a0ab3967b1c95aa419b5c
font_02_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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