Malicious PDF — malware analysis report

Static analysis result for SHA-256 5371aacdc0883d47…

MALICIOUS

PDF

81.2 KB Created: 2021-06-09 01:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 58a19be87b2a792f238107b3d29c7e1d SHA-1: ce64b82efb46a0627fc352fd79b583d602d7f485 SHA-256: 5371aacdc0883d47cec2ae7a8e131744539658d0a91a847affd4d3de88262944
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The primary URL, 'https://queure.ru/pbw?utm_term=pet+leveling+wow', suggests a lure related to online gaming or a similar topic. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of outbound links, likely for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or content-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/pbw?utm_term=pet+leveling+wow PDF link annotation
    • https://tozuxixawijere.weebly.com/uploads/1/3/4/5/134523333/dowadefoguxub.pdfIn PDF document text
    • https://mapogukokerezat.weebly.com/uploads/1/3/5/9/135987870/tixol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5fcd67bd2aec3.pdfIn PDF document text
    • https://miwovobapenatoj.weebly.com/uploads/1/3/4/2/134266375/konir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_602a53713aebd.pdfIn PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/rovelo.pdfIn PDF document text
    • https://vinixojaz.weebly.com/uploads/1/3/5/3/135312356/kesasofedezez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veweran.pbworks.com/f/faluvuxuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32324cc2-afef-4b9c-8bac-009a7d7c0bfb/libro_felder_balance_de_materia_y_energia.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/144492810/dominion_east_ohio_gas_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ddc647-2799-485b-b582-218faf20992d/57909132824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0350fa-2c30-4b11-bf63-21fde1405ecc/15613087681.pdfIn PDF document text
    • http://gapufipi.pbworks.com/f/dd_descent_into_avernus_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc96cdf-3453-4723-8419-6d47f9fd14dc/what_literary_devices_are_used_in_tell_tale_heart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07992cf-ca4d-4e17-9edc-92bd0c87ccfc/27703365408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594b2b05-dcf6-495e-89fc-877e5808d06f/how_to_reset_nuvision_tablet_tm101a540n.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f63b931-0e0d-4307-8809-93ec7b1ae05a/jiwagudotanopogabibo.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_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 4524 bytes
SHA-256: a7f5363c9bb51e109a4f6f26fc6085faa3dd20cd275670a68c26e49696233bdb
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 11548 bytes
SHA-256: 5e310b9c29c6597ee690422494fd9e72b51f0b1552fafdbea3dc1d39ad42aae9

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