Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea37094022eb20f…

MALICIOUS

PDF

78.3 KB Created: 2021-04-03 02:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000023635f571f4a5bd66f9392c0c30c SHA-1: d1e5f7b3a0a8a744a54b29ed6accd8c233e83630 SHA-256: 3ea37094022eb20f7d93c0d1f5b511e6b581b3f518be1be3745d280cc20f9d77
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to file-hosting services and appear to be part of a link farm designed to attract users searching for software. One such link, 'https://lozipotod.ru/123?utm_term=sql+server+2008+setup+free', is directly associated with a heuristic firing for PDF_URI. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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/123?utm_term=sql+server+2008+setup+free
    • https://cdn.sqhk.co/rojawamusula/fyhbanT/mumawusuliki.pdf
    • https://sapemeke.weebly.com/uploads/1/3/2/8/132814969/pobifijok-xutosavirajuvi.pdf
    • https://cdn.sqhk.co/fimegasaz/guidhbV/alter_bridge_wallpaper_hd.pdf
    • https://rafunukogavukuj.weebly.com/uploads/1/3/3/9/133999746/00e4e64a0d939.pdf
    • https://cdn.sqhk.co/vujositet/chhfqC7/guess_the_word_in_word_puzzle_challenge.pdf
    • http://femonejigajape.mywebcommunity.org/17404202773.pdf
    • https://static.s123-cdn-static.com/uploads/4373522/normal_5fee0872a01c4.pdf
    • https://cdn-cms.f-static.net/uploads/4464327/normal_5fd9437b7db98.pdf
    • http://xidasetetobuge.scienceontheweb.net/confederacy_of_dunces_movie_2015.pdf
    • https://jepifobowokeba.weebly.com/uploads/1/3/0/7/130776363/sogozigifus-tosimeni-tigaxaru-wapulem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/96ed11ed-c46f-4c92-b273-2b5fc3b03ad7/74000547253.pdf
    • https://uploads.strikinglycdn.com/files/5c84f431-0b8d-4666-b65e-da1d106ffe25/grammar_english_lessons_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/9116cd9c-d477-49eb-8449-6fd72a2d1e9c/lokedijunad.pdf
    • http://japamitafixe.myartsonline.com/13360953228.pdf
    • https://uploads.strikinglycdn.com/files/55e752e3-c016-49e6-8a65-47cccdd221ad/domaliziwisuj.pdf
    • https://uploads.strikinglycdn.com/files/1e6ed6d3-d611-4cf9-843a-a79a6ce3f14e/evolution_a_theory_in_crisis_amazon.pdf
    • http://muvamubas.atwebpages.com/bus_eireann_timetable_dublin_to_galway.pdf
    • https://uploads.strikinglycdn.com/files/7d431717-0253-40f3-9be4-5a80f510e7e9/kupazewijibil.pdf
    • https://uploads.strikinglycdn.com/files/b8d2e0fb-9a77-4beb-83a6-f7a62d3bd4d8/nuweju.pdf
    • https://uploads.strikinglycdn.com/files/4e5cdc20-c2e7-4b94-9654-fde9d48ad4c4/how_to_design_vinyl_decals_cricut.pdf
    • https://uploads.strikinglycdn.com/files/6b51cf7d-40f8-449b-a9dd-7cc1f9befe81/59921047283.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_off0000f4a5.bin
bbd505d350c15ef5409acd9b4068d623aa4be5e7371ecce0dcfd1ed94d79d629		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 5444 bytes
font_01_sfnt_off0001074b.bin
79c5b42e09f66c793746c1cde70fc2d30cfb803adc8fd8cf291ce3e555ed903d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 10876 bytes

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