Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b6b9f5749e6f7c…

MALICIOUS

PDF

70.7 KB Created: 2020-11-18 08:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec0c35c837feaaface10552d47a369cf SHA-1: 1802758d0c5dafbcf916af4cf80fded08f2a8f72 SHA-256: a7b6b9f5749e6f7c7c06e24d25836906ed374514ff50858fa2a769bd60b043cd
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, flagged as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV and ML classifiers also identified it as malicious. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=accruals+ratio+balance+sheet+approach
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/kewapexisew.pdf
    • https://tonurokekar.weebly.com/uploads/1/3/4/4/134456200/89ef3229aa.pdf
    • https://wokewimafagi.weebly.com/uploads/1/3/4/5/134598023/f6f54d47859.pdf
    • https://lowurewuxuvid.weebly.com/uploads/1/3/4/4/134464573/vorid_fovasuxoxatafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kitakilesa/68305962397.pdf
    • https://s3.amazonaws.com/nefomojuwet/d_d_5e_polearm_master_build.pdf
    • https://uploads.strikinglycdn.com/files/8eb9a2d4-9363-4f45-928f-d4b1661375b6/wezitoxenamofijox.pdf
    • https://s3.amazonaws.com/henghuili-files/fsc_biology_book_1.pdf
    • https://s3.amazonaws.com/rodakarugupoko/wound_care_guidelines_hse.pdf
    • https://uploads.strikinglycdn.com/files/0484153e-4974-4721-948f-6fa9ed84745f/call_of_the_wild_lesson_plan.pdf
    • https://s3.amazonaws.com/muxegeza/christmas_latest_video_songs_free.pdf
    • https://s3.amazonaws.com/nigimul/milady_chapter_15_study_guide_answers.pdf
    • https://s3.amazonaws.com/godoremitiwuja/juarez-lincoln_high_school.pdf
    • https://s3.amazonaws.com/xozeb/adaptive_control_system_book.pdf
    • https://s3.amazonaws.com/jeworurowam/betanewumuweneloxi.pdf
    • https://s3.amazonaws.com/jexijer/49071778287.pdf
    • https://s3.amazonaws.com/legenapi/graphic_organizer_template_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a5.bin
4e91bf17538d51c57cb7ccda1bf2b242beab193a21c5f2acf8e96bd309f17c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 5032 bytes
font_01_sfnt_off0000daa8.bin
6d13b29947e9356a373fc9817aa335883f72d0200cf759fe3c05961b41cfd7d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 10784 bytes
font_02_sfnt_off0000ff88.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 4324 bytes

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