Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1a93ab14f0fa05…

MALICIOUS

PDF

79.6 KB Created: 2021-03-12 08:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9637d16eef178d4834a7715f7094653e SHA-1: db94df9868d2855a3f1749d7b4468bba395082e7 SHA-256: ab1a93ab14f0fa0566099534004eccd48360be58573781b4bc33903d8018395b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one pointing to a suspicious URL that appears to be part of a link farm or SEO manipulation scheme. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt, likely leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=kabar+kukri+machete+kydex+sheath
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/misunek.pdf
    • https://cdn.sqhk.co/gituxogud/hAHja4R/jadunifabakukufu.pdf
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/4224922.pdf
    • https://cdn.sqhk.co/govazofaj/haiacgi/87885217841.pdf
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/nutadetedo.pdf
    • https://cdn.sqhk.co/refuvowur/ijdig1e/dasosi.pdf
    • https://cdn.sqhk.co/pimabosi/jahagjx/beautiful_wallpapers_for_desktop_background_3d_model.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mukut/area_converter_app_for_android.pdf
    • https://c055b2a1-966a-4c01-8d27-fc15ed7e73dc.filesusr.com/ugd/e3c460_53af4b22b37946f6b236434142c06d00.pdf?index=true
    • https://s3.amazonaws.com/vuliwisuwig/77027992851.pdf
    • https://s3.amazonaws.com/zafirawit/lenakakijukamitifoziv.pdf
    • https://s3.amazonaws.com/sazariwapa/therapeutic_apheresis_guidelines_2019.pdf
    • https://uploads.strikinglycdn.com/files/1911a43e-7700-48e8-9785-367216b3ec79/biology_the_dynamics_of_life_crossword_puzzle_answers.pdf
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_fe4ded01c0a546708c1d79b49c27aef2.pdf?index=true
    • https://s3.amazonaws.com/rezugekolaba/lolajat.pdf
    • https://s3.amazonaws.com/muvarelo/joxiredi.pdf
    • https://s3.amazonaws.com/bevekizadoxuj/zowuxakefixigowuva.pdf
    • https://s3.amazonaws.com/mexijegedakol/abcd_2_videos_mp4_pagalworld_com.pdf
    • https://s3.amazonaws.com/dutimajizowa/14493451442.pdf
    • https://uploads.strikinglycdn.com/files/faeafde6-e66f-40fc-be3e-5186e339e456/is_panda_express_teriyaki_chicken_keto.pdf
    • https://s3.amazonaws.com/jobavo/jefojimejitegofoledovuwej.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_off0000fa6e.bin
c94f34945f4dff322ef3f9183bfd173b96426db85b24679c5f6f2f5630babc1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 5488 bytes
font_01_sfnt_off00010cf9.bin
37644d7e07a4fb8195c1f526235459368c76f311a68a3d632d6ae3100cc3b120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 10632 bytes

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