Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f5ca3769789df3…

MALICIOUS

PDF

78.7 KB Created: 2021-04-03 12:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 19e373ff133e9a7ae5ac17045deaa726 SHA-1: bd87dd1352f9e677e6eb64428c2ad6037c286271 SHA-256: 76f5ca3769789df35055d35d67eb9a529b9063c7bff0073b266fad73cbab98f2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/award?keyword=carrier+egypt+catalogue+pdf PDF link annotation
    • https://kakujaboregoj.weebly.com/uploads/1/3/5/3/135341432/kizexomapop_mulumoj.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/lales.pdfIn PDF document text
    • https://zukusabaxiwig.weebly.com/uploads/1/3/4/0/134000387/6bfeb9.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/bLViijj/emojination_3_emoji_game_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/cjejbHF/telegram_app_download_apk.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/a0265.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/4865795.pdfIn PDF document text
    • https://botiwugagow.weebly.com/uploads/1/3/1/8/131872238/649a23e2.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/MgdhiJZ/mifasunuxefakenapakelepen.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/Of6Y9ie/cupcake_recipe_lemon_meringue.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/chhgjOU/75519871578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f21d81-4e95-4fa6-b9ba-a490f4f80f7c/bluetooth_software_for_windows_10_free_download_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/authoritarian_personality_theory_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d0f852-ad39-4b47-8e88-17733803dc7e/vorulumelolide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94c1a06-3748-49ab-828a-37e72760ab77/kewafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b649802b-8d65-4351-a469-08f2297235f3/lezajadobobodevupul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0376081-1532-48d8-a441-1a66487759db/how_to_update_g1100_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b070df29-7a90-451e-8032-51dc9c43b5ad/91835567117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed5374a-c76c-4f50-9cde-2791baabb82d/33476962755.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/the_other_side_of_heaven_2_fire_of_faith_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf36cba-77b2-41bd-bb4c-0764f69020a1/siwagonas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4682e137-a843-42ac-b6de-3c27d469e99a/graco_nautilus_3-in-1_car_seat_crotch_strap_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3794cb0-0ce8-4f79-981f-9536813cab21/how_to_open_a_supra-c_lock_box.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 5152 bytes
SHA-256: 37c13884cf78549d1c2ab6c04de01290e2149c903300e18b4927558c66c0ab4d
font_01_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 11044 bytes
SHA-256: 52cae4d9c204cde82d4c6c2ddde1a815924d23d25d0bfb2b0d6a5f3d860ee282