Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b85b4c4991f0f0…

MALICIOUS

PDF

82.2 KB Created: 2021-03-23 22:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19f89b34af96eb1062769cedda1353ce SHA-1: 9573f10746e08438b23e84f91a606849188ef7a6 SHA-256: b2b85b4c4991f0f059663e84e1d5e4a605bce32668db6f10ea228a09014362b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The document body and embedded URLs suggest a tactic of creating a link farm or SEO spam to direct users to potentially malicious content, disguised as relevant search results or document titles. The presence of external URIs and a high number of linked PDFs points towards a content-driven lure.

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://lozipotod.ru/wix?keyword=like+water+for+chocolate+february+questions+and+answers
    • https://cdn.sqhk.co/vabolepibe/8jcgcje/ship_tycoon_mod_apk_unlimited_gems.pdf
    • https://cdn.sqhk.co/fekawitaxug/ijeqgef/extreme_power_boat_races_2020_dates.pdf
    • https://kubinivoboduwu.weebly.com/uploads/1/3/4/6/134601548/kusekirelewobes.pdf
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/tefuziros-pojagejezogozud-wefegutiwo.pdf
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/vimop.pdf
    • https://cdn.sqhk.co/jerizukop/hjhhkic/how_to_clean_gravity_bong_socket.pdf
    • https://cdn.sqhk.co/wanukawuwota/jfgj0H1/homeschool_curriculum_1st_grade_california.pdf
    • https://gozaperirij.weebly.com/uploads/1/3/1/1/131163841/2046513.pdf
    • https://cdn.sqhk.co/pefisemise/eVkge2N/bingo_blitz_cheats_coins_credits.pdf
    • https://cdn.sqhk.co/wobuwozavenu/4jcAidt/dusevevagikineremaxe.pdf
    • https://cdn.sqhk.co/rekubapapup/ihihigw/ziruxifepevalukobedo.pdf
    • https://cdn.sqhk.co/xovujiroveg/bgjcpFy/etude_house_face_mask_hyaluronic_acid.pdf
    • https://furuxobukupid.weebly.com/uploads/1/3/4/4/134403967/jexizevikejaror.pdf
    • https://cdn.sqhk.co/vizakifito/3jfjjic/43059810731.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8d0472e0-585b-4ea9-b762-045c5526bc19/86722780811.pdf
    • https://uploads.strikinglycdn.com/files/169ae8df-4aca-414b-bf35-c0a19d60e234/short_horror_stories_in_english_for_class_8.pdf
    • https://uploads.strikinglycdn.com/files/be6351fe-e053-4fe1-a167-a5c3845aebd0/4553945478.pdf
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_a1f65e8ebbc04df2a658de7e0ecc6be2.pdf?index=true
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_33a358d0ff604f5f9fcd17dbf78206c2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2ee80fc-4774-44a2-a7aa-982db08659cb/liwiwafurerukufuvewugexus.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_off0000f4e5.bin
ccdea42a016e95363e1f67bceca7dd361fe70573228f4ace5025c9a7a7bb6525		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 5456 bytes
font_01_sfnt_off00010777.bin
6a585298bddb084816b48781b83231c154db7c91ee5f74508550eae20a8e66eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 11004 bytes
font_02_sfnt_off00012cd3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 4324 bytes

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