Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70aa70874176205…

MALICIOUS

PDF

73.8 KB Created: 2021-02-28 10:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6c37d7355718f5576d2ac498cd23bfc SHA-1: b8c27af8604c500b1efc5fb43240f63c5167cf22 SHA-256: e70aa708741762052e7c760cfb24bc93214a273d823061c67808f7dc81aca110
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites, many of which are suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Pitch class music theory' and 'wkhtmltopdf', suggesting a lure to disguise the malicious links.

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://xezojetit.ru/123?utm_term=pitch+class+music+theory
    • http://nanolenka.xyz/31893460058uqtw7.pdf
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/49b87.pdf
    • https://cdn.sqhk.co/koxajavu/jgvuNhg/amazon_music_family_plan_cost_uk.pdf
    • http://sixesijilolun.mywebcommunity.org/introduction_to_number_theory_textbook.pdf
    • http://topemuliras.22web.org/70597943875.pdf
    • https://cdn.sqhk.co/porosobof/ige3hhE/jyotipunja_smart_apple.pdf
    • https://cdn.sqhk.co/runetonorox/dgiRjaF/sokotolenov.pdf
    • http://zavodtriumf.com/32028518736wcohw.pdf
    • https://cdn.sqhk.co/sozaxejiv/gVS7ggC/rarodekigetexivixi.pdf
    • http://bobr.space/powershot_pro_9100_stapler_manualjdvgi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buwufofu.epizy.com/kenmore_central_vacuum_parts_manual.pdf
    • http://sajulugebimisu.myartsonline.com/denidijivuxebaj.pdf
    • https://s3.amazonaws.com/nelizenejakarug/vujeles.pdf
    • http://weralawubuzeg.epizy.com/desktop_wallpaper_hd_widescreen_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e465.bin
ec67cbbdc0e9a88ff96a7b578a3b5033dd7a6f83e75d0811fcd6718b15a77a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 5144 bytes
font_01_sfnt_off0000f5bf.bin
6c1cf383c2a733658e5a62e654ecf76ae6d6a1dd84b67f44b010fd4681131965		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10736 bytes

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