Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b98d156111cbbea…

MALICIOUS

PDF

70.1 KB Created: 2020-12-25 22:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0130c27acf97a08a6c5fcb5f4036cf3f SHA-1: b8605832a21a2afd440b4f53b87d54aa20a89fc2 SHA-256: 0b98d156111cbbeaae44517473fd959df86e5a928fbf366d35ae4604c6aba4df
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to 'traffset.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/aws?utm_term=bose+companion+2+computer+speakers+manual
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/e1b58521d77c.pdf
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/e7cd966f47479be.pdf
    • https://buziratefe.weebly.com/uploads/1/3/4/3/134354065/f5b9fdf0068a1.pdf
    • https://matekulelesij.weebly.com/uploads/1/3/4/8/134858821/be4ccaf9cbe769a.pdf
    • https://cdn.sqhk.co/pujunuzivas/hiZ1jgC/detutavubumezewabulerep.pdf
    • https://wolalusajiri.weebly.com/uploads/1/3/4/6/134600438/2377283.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4f28cc69-80a7-49e6-8cd5-5d43ba76bc69/70655341973.pdf
    • https://uploads.strikinglycdn.com/files/e984f0c2-39d8-437b-9733-16a2d2a96020/lodozurotonomidesumed.pdf
    • https://uploads.strikinglycdn.com/files/96cdca18-7791-48e0-8c2c-f717da4e879c/kuwamadipulo.pdf
    • https://s3.amazonaws.com/daxemo/free_employment_agreement_template_nz.pdf
    • https://s3.amazonaws.com/mesotodimus/creative_curriculum_lesson_plan_template_for_preschoolers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d008.bin
70c2db3d5a0a21ef014c025b5268667b3580ed04fd620bbc51e8c4be6c6c3f94
pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 5324 bytes
font_01_sfnt_off0000e214.bin
3f1ef1dc1d4f4eccce09d68dd73490148f7a5c17663b68626bb2011fdfe6d9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 11900 bytes