Malicious PDF — malware analysis report

Static analysis result for SHA-256 44512540ac838737…

MALICIOUS

PDF

69.7 KB Created: 2021-06-10 04:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 569cb3b3f367aab0aca877f2aab37536 SHA-1: 56b261c50d68a9a2bf25d86b51306ee247a3351a SHA-256: 44512540ac8387376ca08d8fa4528a7ab4cf9c180aa0d70d182c9fda78463878
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to direct users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into downloading an archive, for which a password would be provided, likely to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/pbw?utm_term=brahmankar+and+jaiswal+pdf+download PDF link annotation
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/9287626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494866/normal_5fc9aa8eabd2b.pdfIn PDF document text
    • https://burodinijosago.weebly.com/uploads/1/3/0/8/130813714/guxitajikujurev.pdfIn PDF document text
    • https://gimusoziwibod.weebly.com/uploads/1/3/4/8/134866683/besus.pdfIn PDF document text
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/6467025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383334/normal_5fee3781ca7c8.pdfIn PDF document text
    • https://najatiruz.weebly.com/uploads/1/3/0/7/130738831/31d5c8b7.pdfIn PDF document text
    • https://rawunawikurek.weebly.com/uploads/1/3/5/9/135967659/9911414.pdfIn PDF document text
    • https://getazepamotiga.weebly.com/uploads/1/3/4/3/134352900/9e7930ee.pdfIn PDF document text
    • https://nixodogal.weebly.com/uploads/1/3/0/7/130739919/2858738.pdfIn PDF document text
    • https://komiwego.weebly.com/uploads/1/3/2/6/132695384/ea843.pdfIn PDF document text
    • https://xusolufazajone.weebly.com/uploads/1/3/1/3/131383045/jegumiw_seluvufegabo.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/legaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daridameku.pbworks.com/f/how_can_you_tell_if_an_atom_is_in_an_excited_state.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/w/file/fetch/144515874/99115935463.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/nasa_meteor_warning_2022.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/monosacaridos_disacaridos_y_polisacaridos_ejemplos.pdfIn PDF document text
    • http://xumamiz.pbworks.com/f/92007393325.pdfIn PDF document text
    • http://zatesil.pbworks.com/w/file/fetch/144993258/dil_to_pagal_hai_hd_video_songs_free_download_mp3.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144467502/52423849649.pdfIn PDF document text
    • http://lomades.pbworks.com/w/file/fetch/144923871/mahanagdong_geothermal_power_station_advantages.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_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 5564 bytes
SHA-256: b06fe681d2972fbf24d08b22841d324d0bc9d497ee285a138d0498d7261d6b8d
font_01_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 10544 bytes
SHA-256: 7932706dd80b77ef3a8850601fcf7e2a45c332b4138c865d6b07256ff29a23e5

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