Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e181b7d21def99…

MALICIOUS

PDF

76.3 KB Created: 2020-12-21 16:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 340640f23e5af174e60e751d0d14e1ad SHA-1: 1cc5c05390efcbeea47d19c8daa64af66c11ec81 SHA-256: 25e181b7d21def99942e142f06563b15b8a6979e4e2d225b0de1686fc1587986
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is trafftec.ru, which is likely used to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to 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://trafftec.ru/strik?utm_term=polytone+mini+brute+jazz+guitar+amp PDF link annotation
    • https://gobuxasab.weebly.com/uploads/1/3/4/6/134608876/3449962.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/a62c919e-0a7d-48c5-ae10-8ceb90d8e8ae/directions_to_fremont_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fe0b1c-7504-4cfd-9d87-9b79fbc2417e/kim_sejeong_i_live_alone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0125c1f9-e8c5-49b7-98e8-ffaef66767af/13538387787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b1f299-31ae-4e82-8e13-42b1b3b6ea94/38815921826.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/misofowamupurofolanojiz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57785be9b69395129ae53/t/5fc74ed0788a962b7c2cde6d/1606897361765/pmp_project_management_professional_practice_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2538dc66-6f15-41d6-af0f-3f7e93034762/mugeser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a346ba-6b27-49cf-a07f-cfb0ccaf33a5/44629223956.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c9b1a5bc066edfa528b7/t/5fc163af145a8629dce4fff5/1606509488028/drivers_license_renewal_pasco_county.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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 5332 bytes
SHA-256: 3564bc5b92d91489b043537c0c0563bcc83b6865eb4143f22467c24ac5af4990
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 11640 bytes
SHA-256: 9104a81649f79a2b3e0143c6422b7ceb62a370d6e1398fa85c4cf653e31c1145

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