Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc99aeb7b62578e…

MALICIOUS

PDF

68.0 KB Created: 2020-12-05 06:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: af29ba795f4ba21fa762ad1160a0f47c SHA-1: 0f0040bc906b7d88e7b19b12a947158635e3e7ad SHA-256: 6bc99aeb7b62578e36ddd8f5dc2bb2111838cf42b922b76afc6dedc85c083478
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://trafficel.ru/123?utm_term=mythic+mobs+config', is flagged as suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

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://trafficel.ru/123?utm_term=mythic+mobs+config PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390680/normal_5f92cf74ce105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455197/normal_5fa35dc9e54dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5fcaee6edd26b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5fc57c37efea9.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/9fd39cb015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_5faba12382f66.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/a0578518-aa60-472a-be3c-7bdcf126711e/bivizoromadob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98bf4638-11b9-4e65-9050-3c6d9659b2bc/71202052612.pdfIn PDF document text
    • https://s3.amazonaws.com/vezosoluvezoj/grade_1_english_worksheets_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e451026-5e19-42ad-85a7-9a29f357e729/toriruwojosemek.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/atlanta_falcons_injury_report_week_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa85125-9f89-4511-ab54-704d80d6019c/24174712752.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_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 5204 bytes
SHA-256: 93cdb46fe2c99ff0d7b194b0754a3c9dca20b600374656a988df46cc1f8f156a
font_01_sfnt_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 11212 bytes
SHA-256: b37414db39893a0052f99bab662892dc974424058c78a1b24081e4f62c1715d4

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