Malicious PDF — malware analysis report

Static analysis result for SHA-256 662370e11872f261…

MALICIOUS

PDF

83.4 KB Created: 2021-04-02 15:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c6c9d7f4d1a61270a57d354e81c9cd1 SHA-1: 7508c0b3e164ba50b2b5db051c898cbfd3f7f897 SHA-256: 662370e11872f2615d249e2edb20847ba599fe204c96034935108396a790ff3b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/wix?keyword=componentes+internos+de+una+computadora+ejemplos PDF link annotation
    • https://zorimogitew.weebly.com/uploads/1/3/4/4/134487520/wususugivip-jonagogemavilu.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/xusujepo-jugarow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454280/normal_5ffd299200cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_5fdbfa4e1e512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_6063c99fc22a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_602426ed8facb.pdfIn PDF document text
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/sewinikax.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/juxuwopilobazirekunu.pdfIn PDF document text
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/fupeb.pdfIn PDF document text
    • https://fawitazekivaji.weebly.com/uploads/1/3/1/4/131454143/wosurajixixov-podepagexupe-filemenowoxegos.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/9956491.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/wusamefazotub.pdfIn PDF document text
    • https://jefibapo.weebly.com/uploads/1/3/2/7/132712451/765ae.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/6416741.pdfIn PDF document text
    • https://bajawefigorega.weebly.com/uploads/1/3/5/3/135339811/wubuvelukav.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/0274b0f75e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_604ae049bb2ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0464c436-dcfd-4c0e-bd0a-cafee86b88c1/what_dog_is_tintin_snowy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9c349b-c5a3-4dd0-944f-72f65799428c/what_does_my_name_mean_magnus.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/exterior_angles_of_polygon_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/chocolate_songs_prashanth.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/lumigovisinaporoloje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f9c4b9-5575-46f7-90c8-4540ce885b35/pibidow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 5200 bytes
SHA-256: 0d3eb9da91690623ad224692439aac28a4be72b8125023949f7241f551d6ca1f
font_01_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 11360 bytes
SHA-256: c15c842a3004fbe268828318eb453d29d9f1cab942ff0c7da1dc4fab5fb089ae
font_02_sfnt_off00012fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c