Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2fbfdcbe05393a…

MALICIOUS

PDF

61.5 KB Created: 2021-01-06 07:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d974f788f75d900b783709bc1b62c233 SHA-1: af3aefbfcd3f9585da498bebceb430ab7f5e8456 SHA-256: 7c2fbfdcbe05393a86a76d34c8a249cb58ba4517e01ba060c5ee75bd2662dd62
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are part of a link farm designed to redirect users to malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ggtraff.ru as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=introduction+to+chemistry+answers In PDF document text
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/5850595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531626/normal_5fde35da70b2c.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/fd2901f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_5fc3d7d260aa8.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/3db98216-ffba-49fe-bb81-38e59025ea0f/jakinitolexagabuxodax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089b316e-1203-4ac2-9c98-0145ea5116b7/tour_guide_jobs_washington_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6f6a83-24ca-4af0-aa70-d17b27ef302a/kunafelekavinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e596722d-9331-4575-9d13-e45f532e8295/greatest_integer_function_graph_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d6cfcc-aa58-428e-bc5c-5fe520422556/nunizupijinofakivubigaxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303862c4-076d-4f2b-b6bc-42d326f1f1ae/mapuguzefometusogilogov.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_off0000b495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB495 5276 bytes
SHA-256: e0e3ebeb5b07ba7fb1bb3bc179b1c9e917072bbfbc9923e78045b8f9a2951df3
font_01_sfnt_off0000c66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66B 10372 bytes
SHA-256: 9100e16b48e9bb1600af9e779b550810f5e2c7bb4fb8af6e2b44b37c47249f7c

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