Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c2cdcdf214525d…

MALICIOUS

PDF

84.9 KB Created: 2021-03-24 18:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d610b352b7259d37b28edfe90218d84d SHA-1: 4bd2474e89b55f56e0e3dd03ba7de7ab9b0bc978 SHA-256: f7c2cdcdf214525d646450cb43d9d00edf2f37818dcefc9d3ffcb02f1d68de58
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to potentially harmful websites.

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://resalured.ru/award?keyword=adeptus+titanicus+2020+pdf+vk PDF link annotation
    • http://lnstagram-helping.live/excavation_permit_to_work_template6g96e.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/ijie96v/bidisofipa.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/jehcvwx/hepatic_encephalopathy_prognosis.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • https://cdn.sqhk.co/wewisadavoj/jjfCIhb/rakirubetozavexuwujafos.pdfIn PDF document text
    • https://cdn.sqhk.co/danuzenanini/f1Ijc56/69832761378.pdfIn PDF document text
    • http://online-bestshop.xyz/68081860219ddefd.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/AiihgIU/granny_mod_apk_mod_menu_nullzerep.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/ZtzieCt/39409235982.pdfIn PDF document text
    • http://vodoroding.info/orbit_easy_dial_sprinkler_timer_instructionsd8rca.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/YNheijg/android_tv_netflix_not_working.pdfIn PDF document text
    • https://www.warhammer-community.cIn 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/355bab16-ab33-417a-ac6b-5a0e79852259/94200563818.pdfIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_e31f23964d3049e68800eb17bcb300f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vajefam/akalicious_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1568dba0-8c89-4f41-9c47-a2460aec0965/4530929496.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/un_agenda_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf8627d-5e3f-47df-9b6a-a5f110262f41/health_ometer_digital_scale_change_from_kg_to_lb.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/buferaririsafosunokubewik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4f707d-9367-42b3-be38-b3b2f28d321b/86923839730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950f0d85-7202-41a8-b9cc-419591453cdf/zafosoxeruke.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/what_is_the_habitat_of_the_rainforest.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/rafuzikifabixegesupivoziv.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_a04934658fe9402cbf789d52dfc54221.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 5408 bytes
SHA-256: 3e3d8f705df31948ae19ec93e247cc01944c5a0a72574ad5fd500fbc5fb64b7e
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 11036 bytes
SHA-256: cb96c230f6bd45967453f1289a1a4b47fe9a45efef0ff298448cae27cf8270c0