Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16427ce78462d76…

MALICIOUS

PDF

73.7 KB Created: 2021-03-09 05:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 987830cdd108a7ee0376e9c5bc4117df SHA-1: e005043833e402aad78f06e7a95df1c4a677893d SHA-256: f16427ce78462d7608f1a7067654a7dd5e0fbab5b7a6c3681414e6129d787b00
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to direct users to phishing sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=awdhesh+premi+ke+bhojpuri+video+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_602a32342e0ca.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/c94acd022c374a0.pdfIn PDF document text
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/2353850.pdfIn PDF document text
    • http://websporizle3.com/druid_archetype_guide_pathfinderfuk5j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5ff1d528ddbfd.pdfIn PDF document text
    • https://gorasugaki.weebly.com/uploads/1/3/4/7/134766712/a4ffa9cad491.pdfIn PDF document text
    • http://getplafond.xyz/vobuwijafebipizajirec70dz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1318936-5670-4d2e-ab35-fc3f53ba5dff/the_bread_bakers_apprentice_focaccia_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/odia_bhajan_dj_song_2019_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e41985a-aef2-490d-9d2a-2651597fad8c/what_are_the_types_of_satellite_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/chicco_keyfit_30_stroller_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/do_any_vampire_diaries_characters_appear_in_legacies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2047e258-4201-443f-a087-889c8f0ab405/what_is_the_best_0_turn_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/47073745254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd0e899-5659-4c10-9548-c0dc0d57ac53/yale_brown_obsessive_compulsive_scale_interpretation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62e5dc8-8a7b-435b-83e3-278bc31d9916/detafubosuwebu.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/85327860744.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_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 5460 bytes
SHA-256: 75c4c6de939f6137266f1f61acfd62443fd5d93a76fe30b34a5748fd8b8cb3d2
font_01_sfnt_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 10456 bytes
SHA-256: e8d6b38ed4a4a0909d191b5f0822de59d6675dd94e71b17c03a139269e2ad7c8
font_02_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 8072 bytes
SHA-256: fbaee02e28322490a519ae6d85f3c8577669c1d022f125c6b09bf1f44c01880f