Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9b7f5fba7c815a…

MALICIOUS

PDF

78.5 KB Created: 2021-06-01 18:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3cdd65a820c9c15b14803941c26cb03f SHA-1: 0f25931b766f34a42d70e1a720a62f34c639d176 SHA-256: db9b7f5fba7c815afc5143ba8a614d5f2213618c708e2417e4a3dd7c26f77dc3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are disposable and hosted on services like Weebly and Strikingly, 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 URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://baarspo.ru/123?utm_term=go+grow+glow+foods+quiz+with+answer PDF link annotation
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/bcc72d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_6044a4245fb52.pdfIn PDF document text
    • https://gazufasuro.weebly.com/uploads/1/3/4/4/134482956/rinosab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_606889c84e4da.pdfIn PDF document text
    • https://rejipunedeze.weebly.com/uploads/1/3/4/6/134652096/bobirewidekutigetot.pdfIn PDF document text
    • https://fanedidunosav.weebly.com/uploads/1/3/5/3/135345804/0d1def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_6057994bdea3f.pdfIn PDF document text
    • https://wiwujakibites.weebly.com/uploads/1/3/0/7/130740442/guxefifetogag_vevefomumuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409000/normal_5fe30bf1451bd.pdfIn 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/092cbccb-5e82-43cc-845f-b1b10658465a/lasko_wind_curve_2554_tower_fan_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f258f08c-2513-4998-b6f0-060bfdf368f5/bidaxixuguresegovezifixik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a0ee21c-563c-43af-90e3-9a92f3e82082/go_tell_it_on_the_mountain_song_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e4ef28-45ea-489e-8b32-33260951e6b1/96728517267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcc3bc9-7f92-41d5-a59a-a7a4be9bb615/95330671177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646bb402-d3dc-4aad-9c59-4a731f48ac3a/keurig_mini_plus_black_friday_deal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f8d5f8-60ac-4c01-b6c5-ffd27b548a5c/will_roomba_work_without_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d85e3a-b23e-484a-bef6-0b884b362e50/5_main_rules_of_softball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637fd552-c593-453a-bc81-91473d6ae0d2/what_are_the_theories_of_behavior_modification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b112c9-3686-4e56-80bb-54874558f742/84969788754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ec9dca-1bfe-49c9-9392-b00acc1981fb/tres_metros_sobre_el_cielo_2_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5119d467-4634-4607-a4a9-5a7348feb906/93169233089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b14b4a-2078-434a-9dd0-9e743042ab1a/2017_amc_10b_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db44ed1b-f818-4cfd-84ed-7a58015afcaf/how_to_obtain_a_driver_license_in_massachusetts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cae045f-f54d-40e7-8435-16c4aa3efe45/32701989179.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_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 5468 bytes
SHA-256: 495687e2ee2d56b5e4524e05d000a98123e4fef73467ac403f1838e479b80259
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10980 bytes
SHA-256: 96a100b86c81ebd602143c9d916df335b40606b96ea658d1267cf0e288d496b3

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