Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b03aac6888050f…

MALICIOUS

PDF

77.0 KB Created: 2020-12-17 17:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7149ccac5169986bf6db6204022debf9 SHA-1: 8e9f2ba6d679c4538c89e735bddec535e9299427 SHA-256: f5b03aac6888050fb22d1bd03501688fc608d98ce78c23d1547dd6c901f0a52e
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 "PDF_SEO_LINK_FARM". The primary malicious URL identified is `https://trafficel.ru/strik?utm_term=sonic+boom+sonic+speed+test`, and another linked PDF is `https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/rikipawexeb_dapexupaz.pdf`. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=sonic+boom+sonic+speed+test PDF link annotation
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/rikipawexeb_dapexupaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_5fa493468f215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5f8ce06b32d3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_5fbe6bcc1bf0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5fc88887f1d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5f9c0c33eebeb.pdfIn PDF document text
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/2624963.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xojafemori/74584447109.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/causes_of_the_french_revolution_dbq_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d6bb0e-f881-49c0-a0f0-91963e83b70d/34510993951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6a5e9b-ccce-4177-89f8-e4bd7ffcc272/a_link_to_the_past_full_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9298516a-c043-40eb-a6c3-3237137caef1/woposuvuse.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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 5124 bytes
SHA-256: 8ff0c5eac2dd25efc86f71c9615c9f54ded2877e326666e103f8512a9b3b75f0
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10652 bytes
SHA-256: 42a60247c2d135f7720eabe4a8bb4ef460eb510d4b40ed5f41350974033fb30b

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