Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dd3025c31ddf45…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 03:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3a4af039ba10829df009d57c32214e88 SHA-1: b7551ebbbf1a49a80f93579a27428f23b0256b9f SHA-256: 54dd3025c31ddf458f453b716e74aa361ff80fb9b9ff3af325e3604a57090b35
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a significant number of external links, indicating it functions as a link farm, likely for SEO manipulation or to host phishing lures. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to potentially malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/wix?keyword=emoji+graphing+circles+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/daladovum/jynidjd/little_bird_jump_bird_tossing.pdfIn PDF document text
    • https://nabizajeti.weebly.com/uploads/1/3/4/6/134640454/a9e66faf41cc3.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/jgie7jf/make_a_birthday_wish_list_online_free.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/3479871416.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/gjX1gWo/lujixa.pdfIn PDF document text
    • https://gixeguxif.weebly.com/uploads/1/3/4/5/134522915/dopukizogarij.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/digimon_world_next_order_best_training_spots.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/ghcj5hj/hide_and_seek_full_movie_2014.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/HYeUjgk/mero_sansar_ma_cg_song_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/p5O9jiQ/83052559259.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/65169296630.pdfIn PDF document text
    • https://cdn.sqhk.co/medipevagopu/3hevhcs/best_hit_songs_of_the_60s.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/ijThgTl/car_parking_multiplayer_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/PjbhbGD/business_planner_template_excel.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/ccie_service_provider_v4._1_lab_workbook.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/karos-lawalije.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/7ea5a0ee-a42b-44c1-93e2-3d880e947186/tumajevunazowajuvamadew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e661dce1-b9e6-4a36-ab37-979aeb20e0b0/gikuwewarisaxukazetolitow.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_d9a5cd62b785421aa87694393c73c3f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4753eaa-842a-4d0d-b74c-9b418fd1551e/american_playwright_you_cant_take_it_with_you.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_a15417176c94457a9f0d8fadaf7a581e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6567f5a3-3838-4032-929c-2b99b1cc5980/cost_of_living_index_world_cities.pdfIn PDF document text
    • http://jimarol.myartsonline.com/ray_tracing_algorithm_in_computer_graphics.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_29eae605554b466e87109b1a74b1cc58.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 5536 bytes
SHA-256: 057e0b3b7b7c2033a42c09efff95df30bf5cc04cdd66a5273a75e0e1374cc196
font_01_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10784 bytes
SHA-256: 383f854c9b698ea3672eaf28d3eb1cbc022b6e0a23f908a99d4d18c0457fad7e
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 16440 bytes
SHA-256: f1ec185c4881e0b48e8231dddfc3ad9f77add950e03505f263c0ac81418b6ef7