Malicious PDF — malware analysis report

Static analysis result for SHA-256 87064e218244a2e6…

MALICIOUS

PDF

68.6 KB Created: 2021-02-26 08:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9ea3d257ca453bc0e8df5046599e44b2 SHA-1: be3ec1d05e75d11ac62fe7ec79278370665b8f47 SHA-256: 87064e218244a2e64139dace124da984447207593079666d7de56c6a4854c3f4
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or SEO spamming operation. The heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to drive traffic to potentially malicious sites, possibly for phishing or ad fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://crophysi.ru/wix?keyword=among+the+hidden+quiz+answers In PDF document text
    • https://cdn.sqhk.co/zoluxoni/os2jjie/amaze_ball_3d.pdfIn PDF document text
    • https://kafefibamivo.weebly.com/uploads/1/3/4/8/134891061/0890b49b.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/purunajefutoxumono.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/Yjd4hhz/pocket_knights_2_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/dXXic8X/new_york_guided_walking_tours.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/warug-jikiwo-dakisikuf-nuluvetoma.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/kujizawojekuliduze.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/YNhZjhg/galaxy_shooter_2018_space_attack_cheats.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/9096883.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/jbs7wjj/pirate_parrot_craft_template.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/12861203137.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/G9ginhd/65158962409.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/kiggggf/98219024830.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/wujokobiferon-gomumixibome-verimiraxi.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/haDjihb/download_photo_editor_color_effect_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/bojexisebiwi/B1jgswb/paralysed_stomach_muscles.pdfIn PDF document text
    • https://cdn.sqhk.co/birofinud/ahbeja4/bc_lions_running_backs_2018.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/john_deere_js63_diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/xokelowajebuw.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_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 5464 bytes
SHA-256: 6c75b9d21b1ff592befc215d48edc4c8e380655bf02e853dc6a1f4223a24cb1f
font_01_sfnt_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 10012 bytes
SHA-256: 04a0176c39208e1664513f2b426f49d4e396c5bf131529cd5fa57129865d8020

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