Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d1f0527e1264f1…

MALICIOUS

PDF

66.3 KB Created: 2020-11-10 04:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: be07ffb2de6a5a2ac40e76723d1f2eee SHA-1: 1994d4afecc3ed3877a2ed82d2f5c2f253b702d4 SHA-256: c9d1f0527e1264f15da079c38babbd203b46007818dfcfe10ca6015396f74206
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 as a PDF link farm, suggesting a phishing or SEO manipulation tactic. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?keyword=word+that+begin+with+g PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380681/normal_5f93f32297b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_5f94137a24a05.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/dusugukowopoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f8951fbd43e6.pdfIn PDF document text
    • https://dedetalorisa.weebly.com/uploads/1/3/4/5/134593476/9e4b3b5b.pdfIn PDF document text
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/a77b0ff.pdfIn PDF document text
    • https://tuvunexe.weebly.com/uploads/1/3/4/3/134327091/9163275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5fa6ce86025d6.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/e68949abad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451742/normal_5fa91b8d340b2.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/nawuvud/62683642351.pdfIn PDF document text
    • https://s3.amazonaws.com/muguroviv/new_episodes_of_girlfriends_guide_to_divorce.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_off0000c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70A 5120 bytes
SHA-256: 1740861d0f798db68166114d46659c63882b5a9c4b6c16cc67666ab3c25050d8
font_01_sfnt_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 10712 bytes
SHA-256: 888133cc463ff33ef24187d08795d2f4c5eb1d0ab0683848e05183b525d1c5b6

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