Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb115ce333d9901…

MALICIOUS

PDF

78.1 KB Created: 2021-03-21 01:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f74b6e9d564b3efe2cbdc199b7feccea SHA-1: c055df029a9e18f0a3cbbb2731fdf67852d222fa SHA-256: 4fb115ce333d9901cd77f195f7c3f99658440a01dbfabc25788994d05c24bc6f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. The primary URL, https://kuzutuzo.ru/award?keyword=cable+tray+sizes+pdf, suggests a lure related to technical specifications to attract clicks. While no scripts were directly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to drive traffic to malicious or scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/award?keyword=cable+tray+sizes+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5fcc4c198447e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_60086da0f3c0b.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/5789062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_6023df93cfebf.pdfIn PDF document text
    • https://meloxatug.weebly.com/uploads/1/3/0/9/130969811/fc5df347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5fdb00a8613b6.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/52e928a3-d0b3-48cf-8a13-50ac9d5eb1e6/92814006997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36b6354-1da2-41b4-9b32-299923bd4896/bijojivisopovora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e6ffee-7312-4035-84eb-5ea03e03824b/play_goat_simulator_demo_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/new_moon_in_sagittarius_intentions.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/new_psoriasis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/crystal_report_viewer_logon_failed_im002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c48c9d-2485-4f24-a4fe-1d2a20e1df32/31582073883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154dd26c-bd0a-4abe-9b47-e4277bdff895/vector_calculus_identities_proof_index_notation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55151a38-bdb5-41c9-a275-effb9a1a8f66/59275484682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f785a29-8b6d-4e8a-98a7-2a69bdb0ea35/69736417579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73189446-5cc5-4d9b-a9a8-77853e5d2d3b/87185183042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83714821-9311-4e7b-93fe-11772dacf939/how_to_use_duracell_power_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31244a22-5c07-46b7-9c28-3c4997ffd6ac/what_are_some_funny_speech_topics_of_entertainment.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/self_actualization_pyramid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba679639-7711-40b2-8a2b-02be7102708d/the_8th_habit_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/vagegeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805f3c04-f7e5-4e67-a4ba-019fceca0cc6/zumulekoxapilumogikibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815d67bc-8a2a-4188-b4dc-d45491c4ed7f/what_are_cycles_in_a_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a49161-3c64-4ea5-9449-a8fa994475db/isentropic_efficiency_of_reciprocating_compressor.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_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 5232 bytes
SHA-256: dc2c863de86805f7591971ad5e99b2247bfacceb20ab89bb49fb5335550d3d8c
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10572 bytes
SHA-256: 32344ec69a07bbea5985d025584cd55582dc53adbb3a61520196d43f5b3554d0