Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5004c4f2736a5a…

MALICIOUS

PDF

163.4 KB Created: 2021-04-12 17:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 100799c8c7c78a9c54d0100097a3de8b SHA-1: 27ba68bed682ac074eaa37fc935cb10aa6f0b3dd SHA-256: 8f5004c4f2736a5ae402bff6238e2b546abc6954676c27a4be04e31c522031a6
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, with a notable heuristic indicating it's a link farm on disposable hosting, directing users to suspicious domains like 'golowaki.ru' and 'life50it.pro'. The document body, though heavily obfuscated, appears to be a lure related to academic materials, suggesting a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=mechanical+behavior+of+materials+4th+edition+solutions+pdf PDF link annotation
    • http://life50it.pro/laludelubogykvaf.pdfIn PDF document text
    • http://bemoxanomazopix.iblogger.org/gegejipejugezokituju.pdfIn PDF document text
    • http://organicnu.info/shiva_purana_downloadyvv8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_60041915f24cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_6066d3ade27d3.pdfIn PDF document text
    • http://maska-respirator.com/sojimixcuftk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_6052ea29d91b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380211/normal_5ffa07bd48ef6.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/f5981770-cb04-478a-beb7-efb20f2b4504/revukabatuboxajuzobubekum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6474a063-468b-4375-937c-add790d762db/parts_of_speech_pronoun_examples_sentences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0b7c37-626f-4510-b340-17ee66037e5b/excel_online_onedrive_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ecfc7b-f03e-445d-9595-9376d92d871e/alh2o6_3_hybridization_of_al.pdfIn PDF document text
    • http://posugez.epizy.com/assamese_bihu_video_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c92b1c-35f3-41c2-af08-cdd16f70ca49/31349454288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf18e292-d7a5-40f1-95f3-71d3a1ee5728/galukopit.pdfIn PDF document text
    • http://mosuzuxogobet.epizy.com/control_systems_theory_and_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5222b8-47f8-4171-b2de-58641c195aff/18643999727.pdfIn PDF document text
    • http://resogugibu.rf.gd/spoken_english_guru_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7f9b66-eadc-4ba9-bd27-23295c09d30e/wevulavulowobomekanetise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4937f2e7-2208-47ad-9c0b-5a125c466e6d/67252917834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6770d3ec-1785-4f54-a982-c9c1d0156331/ken_folletts_the_pillars_of_the_earth_book_1-3.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00025263.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x25263 24308 bytes
SHA-256: 2a35e51861e64d242d7a590f10381de665399eba701fe160866abd55e8cfb960
font_00_sfnt_off0001fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAC5 5980 bytes
SHA-256: a2c07543279f56b474ee41dd59f916584d5305bf915cc5c28c5a98014f6c4f07
font_01_sfnt_off00020f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F9B 5688 bytes
SHA-256: dd185963a9dab29bbaca587b55b94eaff1e7df9ce9512819d18ad9a775a5de84
font_02_sfnt_off000222da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222DA 14676 bytes
SHA-256: 2db99260cf0b06a0e89c3c8d618e25594489e5d536a9bb7c1568fb3c4d646de2

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