Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be2dbc3401b73b9…

MALICIOUS

PDF

72.9 KB Created: 2021-03-10 22:38:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 778965aee1c555f6a08b03d6f7d0049b SHA-1: d74ae04278d1e6b13a74f1aa581694f45ba84006 SHA-256: 8be2dbc3401b73b970eb49c4c7beb47527bac6954ee6c91a66490573677ca21b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The primary lure appears to be a 'personal trainer manual', directing users to a URL that likely serves as a download or redirection point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/aws?utm_term=ace+personal+trainer+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493553/normal_603543af376a2.pdfIn PDF document text
    • http://agentsoft.space/sheex_washing_instructionsox74a.pdfIn PDF document text
    • http://knitfqph.site/charter_reference_code_s0600_mean4xmzb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378393/normal_5fe0fb965fcf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_603c16aa3c410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387218/normal_5fc9b36bd159e.pdfIn PDF document text
    • http://gelchlen.fun/anaconda_python_3._6_windows_64_bitbytt3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_5fe7065325cc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_6031e61017f99.pdfIn PDF document text
    • http://ecoservice-vlad.ru/instantaneous_velocity_calculator_calculus4xgjm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416810/normal_603bbde77d620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_420efdd1116341be979eb7f77b3ce4fc.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_fb9a8ae5c05a42dd98cfab77f3a42f81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fe9208-cc23-4328-94d5-95329163f41f/mtd_gold_riding_mower_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf20404-d87f-4b04-8a2a-013653fb282e/how_to_put_iphone_on_speaker_when_talking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5120a33f-bff2-4b05-b4fe-56494c47783c/subaru_ea190v_pressure_washer_electric_start_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2c80c3-21eb-4609-a91c-b07877993f17/eleanor_and_park_movie_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c968bece-a8ea-40ea-a932-6ceb0d6eb1a7/bojabidoluvuroxa.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_89e1275675ea40128743379bb5816b9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06b4658-7820-42b3-9279-f9a285cb0ff2/xojorosujimogeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6936ed7-ab3c-45b1-b314-0aea16f90ff2/zavezadidupijube.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_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 5288 bytes
SHA-256: 006c57714c48a235ab76b5643db4cf93b8bd22f0f1c787786f558b0214128b18
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 10576 bytes
SHA-256: 74f4ac2393f2865717c756d3125e5b19e1e1fb0cd35ba57fcfd38f55bd932afd

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