Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4163c316c01b48c…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 18:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8886e77cff4bf13efc80a844b6f69094 SHA-1: d0b25f35db64fa1124c980ab3c8c902ce358f4fe SHA-256: b4163c316c01b48c7a404374bcc36f21cf770271f4a92934cfa7956140fa5fbd
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links that redirect to known malicious or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to search results, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/123?utm_term=dhaka+board+ssc+result+with+marksheet
    • https://cdn.sqhk.co/vidujubotaf/fUMKJfm/jungle_adventure_3_game_download.pdf
    • http://xujadawowupu.scienceontheweb.net/bemegezaresak.pdf
    • https://cdn.sqhk.co/rabovafom/gIfibjj/suketozujepixujapume.pdf
    • http://vumajufeboxidik.mywebcommunity.org/cuisinart_air_fryer_toaster_oven_accessories.pdf
    • https://cdn-cms.f-static.net/uploads/4380536/normal_60547654bb5c3.pdf
    • https://cdn.sqhk.co/rorajakura/GqchdzA/34557848370.pdf
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5fe309345185d.pdf
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5ffcf9dc313e6.pdf
    • https://cdn-cms.f-static.net/uploads/4491155/normal_5fd9861d5695f.pdf
    • https://cdn-cms.f-static.net/uploads/4480170/normal_603c719c7690c.pdf
    • http://zodatowafe.getenjoyment.net/why_do_companies_sell_receivables.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/52ad31bf-7bdd-4952-859c-773499206bc2/how_to_reset_asus_rt-ac68u.pdf
    • http://tiwosutodegadax.onlinewebshop.net/2056959911.pdf
    • http://xomutojekes.myartsonline.com/basic_science_and_engineering_drawing_book.pdf
    • https://uploads.strikinglycdn.com/files/0629e675-2f2b-4a6b-8276-72df8eeff477/simplicity_riding_lawn_mower_for_sale.pdf
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_59d1da211f6b4cdeafc8f64f0e2b52b1.pdf?index=true
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_af2fc29d8acf4190876b05fc908c27b5.pdf?index=true
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_da47d827a9a44210a4ebd15e6f945b9f.pdf?index=true
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_fafa9229a79c4ea7b3a4a73abe49d86d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1b8cc187-e0d0-4a13-a067-7c90f128b132/32815083168.pdf
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_24d10ad17a9a47aa9e2f5a8b8e3e6df3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3a7a7c39-cc0f-4adc-a446-d2d33e5a3259/lateral_thinking_riddles_for_adults.pdf
    • https://uploads.strikinglycdn.com/files/8c8b96f0-23a6-477b-bdc8-e328edb81441/how_are_living_things_connected_in_an_ecosystem.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_off0000e879.bin
17438d236e62d9c0dd37c388a4574cb253c87a41551fdc7df223eac72a068eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 5472 bytes
font_01_sfnt_off0000fafa.bin
4dfe9a6b83880fa6827b80de21f28d2c33e124bd5cc1c5d50c843c7970055ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 10644 bytes

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