Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fd181c99d12b49…

MALICIOUS

PDF

83.1 KB Created: 2021-04-05 10:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3e9b945137b046a1ee5690a8f4c1cc8f SHA-1: 1110ec2ac670ab55d773c0207bf1ce373028af8e SHA-256: c2fd181c99d12b49daff97be26db59bea93a16ab9196b07b5e4c5f582bdd7558
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 0.9997

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://jacksth.ru/strik?utm_term=what+is+the+difference+between+elgato+hd60+and+hd60s PDF link annotation
    • http://buyervannakupitvsem.xyz/862634717069u3w7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc63d5ce12c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408879/normal_60092c53be906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453718/normal_5fe673e5a87f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5fddf5779eb2c.pdfIn PDF document text
    • http://natur-bio.space/zoxafulazitowewimijux39qd.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/d45d2d157e98.pdfIn PDF document text
    • http://dreamingdeveloper.com/71693829645kzch2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445869/normal_603bdee5b9e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_602d046c6de9e.pdfIn PDF document text
    • http://fbcopyright-center.com/burrito_bison_launcha_libre_change_characterc7qor.pdfIn PDF document text
    • http://hotita.space/billboards_top_100mqbsz.pdfIn PDF document text
    • http://detonicufficiale.website/21482796190glbaw.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/6ab9e1a7f42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fe59794534f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_604980397d44f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_60129eb477e0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5fec1a2869a4e.pdfIn PDF document text
    • http://sodalabs.pro/kurizutezafovuzobawuposx7xz.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/d77db9f8-8fe8-4f78-8c60-4d7d2993891d/9443423523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cea2d5-2082-4868-9f33-4c91cdb5cf65/47305836512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e642a925-f2b5-4c5e-bc2a-79175802c712/25263050603.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_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 5824 bytes
SHA-256: 7e40553ceedb5ec8c865c23d7868da9cf8fce84f1ebe4e0df0d9ba5d58b28777
font_01_sfnt_off000115f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F9 12548 bytes
SHA-256: 9f0288d0fd04aa5d99febae7045421de0165c4f9fa71608e9c1002b9ffc9a075

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