Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fac49cd19f618c7…

MALICIOUS

PDF

80.0 KB Created: 2021-05-22 19:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad264fd1dec1de56f46646efb88c8294 SHA-1: 59a8621bd40f024ead0992645fe961c8d5e51b0f SHA-256: 5fac49cd19f618c709652752ede5a624b0c1cfb787fe3813b53cf2f644e33aa7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. One prominent URL, 'https://xezojetit.ru/strik?utm_term=how+much+money+does+a+chief+marketing+officer+make', is presented in the document body and is likely intended to trick users into clicking it. The ClamAV detection and ML classifier further support the malicious nature of this PDF, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=how+much+money+does+a+chief+marketing+officer+make
    • https://cdn-cms.f-static.net/uploads/4445573/normal_6036e0826fbdf.pdf
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/b88e5f78e.pdf
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/bitidabubilovepej.pdf
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/faridaf.pdf
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/wigegavopixez_mijumekufiluto_vogadokijog_luxadodusubobu.pdf
    • https://cdn-cms.f-static.net/uploads/4382189/normal_603896ec4cba7.pdf
    • https://timitadenemegi.weebly.com/uploads/1/3/4/7/134728598/texaxudazizato.pdf
    • https://cdn-cms.f-static.net/uploads/4417530/normal_60493e6623264.pdf
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/wigeno.pdf
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/boxamogaze-gudadowajet.pdf
    • https://movalolutipala.weebly.com/uploads/1/3/2/6/132681002/vadesavewomo.pdf
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/sirubolisuvonipew.pdf
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/jewipefumub-wixiramonudepa-notakutefas-dasig.pdf
    • https://cdn-cms.f-static.net/uploads/4500877/normal_600e25c9c6027.pdf
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fd0a760c4653.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ea8b7dc3-339e-4481-bd20-ed09068e673d/nasty_gal_free_delivery_code_uk.pdf
    • https://uploads.strikinglycdn.com/files/e7c374e1-b648-4bf1-859d-a2bc5156f5d6/bible_software_for_laptop_free_download.pdf
    • https://s3.amazonaws.com/novifamigot/vegifujogexolibopizilan.pdf
    • https://s3.amazonaws.com/xoguwavosuje/carnival_row_soundtrack_free.pdf
    • https://uploads.strikinglycdn.com/files/03c8a11c-eb1a-4af5-b00d-14cca661df06/29051058902.pdf
    • https://s3.amazonaws.com/dazinibonofobi/gravel_walk_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/d23f1eda-70a5-4358-8d1c-fd8938baceff/84820276473.pdf
    • https://uploads.strikinglycdn.com/files/2fe45983-c2e6-4a0b-b8a3-3cebe7f11497/learn_how_to_weld_courses.pdf
    • https://uploads.strikinglycdn.com/files/4e90e6c7-dd1f-4a6d-bef3-baf97a9a18de/elkay_drinking_fountain_installation_manual.pdf
    • https://uploads.strikinglycdn.com/files/fd2689e1-e147-438c-8889-fabd83c86ea5/astro_gaming_a20_wireless_headset_black_green_-_xbox_one.pdf
    • https://uploads.strikinglycdn.com/files/6c68b15f-8ead-4439-83e9-9081a6e00116/tuzopasowevorukumad.pdf
    • https://uploads.strikinglycdn.com/files/8786e264-a1dd-45e5-985a-3fb1466d948a/51057851544.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecec.bin
f0c29f78d28e17cdc2f1fcdd737df4a144e72db04c380a3761d5f2dd451ef46e
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 5504 bytes
font_01_sfnt_off0000ff92.bin
f99d89443331c08f944ecbbf25a4c258fb38b0f7546760c90b751cf730d26896
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 10636 bytes
font_02_sfnt_off000123e4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 4324 bytes