Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf77657b07f9aa22…

MALICIOUS

PDF

100.8 KB Created: 2021-03-14 09:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0d318716c34fe1bd503cadff311c3eac SHA-1: 320882569ade38e4c612f2b2028b78359ae51d76 SHA-256: bf77657b07f9aa22f803eaeb1e439762959105be2cd0e3477de60dc5f7412dbd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://botokaw.ru/strik?utm_term=chicco+keyfit+30+manual+newborn+insert PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479213/normal_604db6f69777d.pdfIn PDF document text
    • http://familyit.pro/skyrim_xbox_one_divine_mods_load_orderau662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464873/normal_5fff23be5e476.pdfIn PDF document text
    • http://ital-girl.space/modern_warfare_remastered_trophy_guide_roadmap6hs6x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454054/normal_5fcf07643d3e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_604affe6a3f91.pdfIn PDF document text
    • http://stroiline74.ru/821559951949j39j.pdfIn PDF document text
    • http://libralab.digital/how_many_episode_will_that_time_i_got_reincarnated_as_a_slime_haveoduk0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468814/normal_6007edcd367de.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/be4ce36b-a801-4a65-9f24-b6ff1f59c05d/83688802348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e632a01-9b59-4ac4-b57b-531653c6a768/how_to_use_farberware_immersion_hand_blender.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_477b003b4ac64cf8a3c717a2d333fa20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26b6636-1765-4134-bb12-e42b8c7b2ba7/weber_7661_handle_grill_n_go_light.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_35ac144d4540402898dbd3e7fa4e8808.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0842d9e0-c04c-4bd5-a3dc-a629dc12b64d/64719241413.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_86e4fd386b8e4c9fa510f65e982b1f25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e86d21-b11a-4c75-a4d3-d1a86ec54b6f/how_to_fix_garage_door_opener_craftsman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b29b70-56aa-4dbf-8e03-e9618fbf915f/xenupijoxuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb46ffc-c480-4779-beda-e68335aa3c09/batch_file_hide_command_prompt_window.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cd5739-2228-4566-a45a-a73a90493af5/when_did_christianity_decline_in_europe.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_95898104e6e04797b48a29f13d59cd9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0469040b-4e8b-4ecf-a89b-ea49a7501c50/behringer_q802usb_xenyx_premium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bd92a2-3fd5-404d-ac8a-5a507e1f83a0/josamitilotunawatumawuxut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8301193d-a0f2-43b5-9c97-d35e432a0bd5/finavexof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c50ea2a8-4d02-4c12-9deb-4433bf11a43b/java_8_tutorial_oracle.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_7c3a6d57bb0547a9bae45301652c0fea.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_off00014c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C37 5728 bytes
SHA-256: 198a625183eb2b26f8ee88b3d9d32afddff26ddbd09d061ea814963d439807e5
font_01_sfnt_off00015fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA1 10828 bytes
SHA-256: 2f8a8f0f4ce789b5611630428690ad98c6434508a9e71f829aa4cd70e4d8874e