Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57a9b235b2f96b1…

MALICIOUS

PDF

79.2 KB Created: 2021-03-08 08:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c0c4f9b8cc09ce176193ee9021e92376 SHA-1: 260ec110c6144173b11545ec4b0ea2fc7e986548 SHA-256: d57a9b235b2f96b1a829636dfb6dc2fb842f1edf5cb5de92af053b5851dc1049
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=setting+up+your+fly+fishing+rod PDF link annotation
    • http://gutagige.sportsontheweb.net/regalame_una_foto_translate_to_english.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/d9Qhajc/gixobiwekuzajogimor.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/h1HJGsC/20134516777.pdfIn PDF document text
    • https://cdn.sqhk.co/wemowubire/HQhgcja/43554269781.pdfIn PDF document text
    • http://axecheat1.xyz/zofomaxabig95b1.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/how_to_open_lg_washing_machine_door_mid_cycle.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/P8jcjfT/16445876954.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/96782715087.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/tugazonurabikisapilifefim.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/zoxiberugileled.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/the_anatomy_of_fascism_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/kopozufu/kWjgkgi/1354819981.pdfIn PDF document text
    • http://makedctl.site/325823095184orhv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/what_is_the_salary_of_a_automotive_technician.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0d92e8-c1d4-4a7a-9492-aa9749e289dc/the_prince_and_me_2_online_full_movie.pdfIn PDF document text
    • http://sewepara.epizy.com/14818470823.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/el_lazarillo_de_tormes_anaya.pdfIn PDF document text
    • http://rolizixi.rf.gd/rrb_alp_sarkari_result_answer_key.pdfIn PDF document text
    • http://mipitevana.epizy.com/best_r_programming_course_for_beginners.pdfIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/fobuxomuzutoseralafoxe.pdfIn PDF document text
    • http://vojapexa.rf.gd/nunojepabudaritugeseputa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/367af81c-c0ed-493f-bf53-5524ffe9dc2a/kilebuvusofapij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab95f19e-fcfd-4e78-81a1-f2b741d58910/luruvaxomenisezoxadifefu.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/nokekogomasogat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358f26d0-dac3-4346-ac8c-31db8c93e28b/zefibuvunigemer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7a2ba7-8075-48ac-8826-4970ca85da40/43799227509.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_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 5296 bytes
SHA-256: a3fd9089f44b1f57a86cf44b8c79ee182a3cbf85a283c6451214e0f302dfeb9e
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 12452 bytes
SHA-256: 071aa9387e94ba47b66d11151be37ba85dfa8e76c7cbf0109999f59f0cbc11a9