Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ef1cf2da75893f…

MALICIOUS

PDF

66.2 KB Created: 2020-11-16 19:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 84334e985c60d469a848d7cbd2b2b8a3 SHA-1: 6bcb37d69a0f48f8c9921231e41f3d52283612c8 SHA-256: 31ef1cf2da75893fd50e8c6edcb876f96586e42442b4652f09c52b999f4d4f65
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=lettre+d%2527+intention+mariage+individuel PDF link annotation
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/687f4adf1961c.pdfIn PDF document text
    • https://fatagodudun.weebly.com/uploads/1/3/4/3/134327877/pilirevapu.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/73fd1c54-40c5-4564-a9e2-3a30fc698945/56411757780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb928d8-4be5-4883-a41f-1f2ae73b8151/jofewurugapezanulasabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2581185-9440-4185-a773-5fb6bcdc162f/72721634382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1b724a-af61-40a1-b136-e0849d40dfe8/sikemow.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/69374156837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b167de02-a14e-4be7-8450-d5563f0e2101/brain_integration_therapy_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fcf8f8-6512-4666-826f-0a53d810ebf6/25811545384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b96613-575d-4020-b635-9342ca9063b9/70657391681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732b9f29-35b3-4913-bd08-a40d8b4fe3e0/89953698045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ce2b84-5f4f-46e5-84af-f21739e6b985/will_lens_refract_light.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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 5004 bytes
SHA-256: 590764a57156773e5d4879114a836dd1a129be7b26a588b454aae9add00116f4
font_01_sfnt_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 11768 bytes
SHA-256: 0e9aa168d218ec9b1b82f41263345fc948161c24a608321486874c4257d20278

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