Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f70a0efeb8626e8…

MALICIOUS

PDF

105.5 KB Created: 2020-11-25 06:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d6f43b7e68a1ed8be41b7e39efdea9e9 SHA-1: 97a8c7d2bb804bb5adb9e86e12c7561df66a4522 SHA-256: 1f70a0efeb8626e8c2ea3ee58cc5e481f9f832d9640cdcf8f504d047704a8738
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to PDF files, suggesting a link farm or SEO spamming tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for phishing or to download further malicious content.

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://traffking.ru/strik?utm_term=diablo+3+demon+hunter+power+leveling+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8af270e3a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5f94891a3a8b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5fa769cf86e8e.pdfIn PDF document text
    • https://befejabenitegi.weebly.com/uploads/1/3/4/5/134530095/fefeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f988e2768938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f88258a3038e.pdfIn PDF document text
    • https://delujopasetew.weebly.com/uploads/1/3/4/3/134399242/9567658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f9635176e99e.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/4ff8677d-4ae0-45c2-8a51-1ef483ac0b1a/19655731423.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/paduzowexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c84127-4ee4-44cb-8ac8-bd56d8a417cb/60517943395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec1a50c-57b0-4d43-904c-0057e5fd27be/bipaxuziweruparosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bdfafe1-b492-46ac-916b-ce899fd4234a/narrative_text_fabel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632f42ff-190a-4fe4-a4e3-b42ea8dbe66a/lijejiriduxegagodivo.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/tolifadalakodona.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_off00015f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F88 5652 bytes
SHA-256: 96fecd4d1211d5438c41d0fb35904616415097ee956fe8a0dbefef33c7c7b87f
font_01_sfnt_off000172a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A7 11172 bytes
SHA-256: 50c06387ec5a300c59e2cdab47b7bfe33895d4a0c513276368544c505c1535da

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