Malicious PDF — malware analysis report

Static analysis result for SHA-256 be87f841c05b0f80…

MALICIOUS

PDF

71.8 KB Created: 2021-03-12 08:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 84c7ca4e80789d01c5e22607054f5b9f SHA-1: ea6b7b57dcf07dccbef7459d43dd91c759f0a930 SHA-256: be87f841c05b0f802f1cd128f17638a16fccfe685e28c1508b4777ec6892f7ac
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. The embedded URL points to a site that appears to be part of a keyword-based lure, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=11.3+other+patterns+of+inheritance+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465539/normal_5fdecc858cb4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_60490e1f322ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503524/normal_601ad20c4ed95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_5fd649595b037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_60167f00b044f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_603c388a04885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5fc67376551f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450041/normal_60072ed65e56f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5ff65d966c5a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384045/normal_60010a32074c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483623/normal_5fe9fc26062ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382421/normal_5ff356f8eec28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_603aeac8e74ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_6016eb93be08e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_603e375cec84d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72e8f94-e349-419f-be01-aa754b035c5f/40557632140.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_eec1c591402540a8b7dc0c44344fb22b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51331cf-48b9-4796-a621-afbd421e077d/87155641545.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_96475c823a3644a9948cdb8ae380a1a3.pdf?index=trueIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_b86b418ab8314e8f92050f1607b821b0.pdf?index=trueIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_b46b912b271749129885f2afebabc692.pdf?index=trueIn 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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 5380 bytes
SHA-256: 67d32a5527ef6d4aa59551d14111b8dc33cc0415cca274369bbfd05b36e0dfa1
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 10196 bytes
SHA-256: bde9957c388c9dfd06b32fa0955c8db50aa564f38cf265ef8b7bee014ec71b97

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