Malicious PDF — malware analysis report

Static analysis result for SHA-256 396135ce59ff6a7f…

MALICIOUS

PDF

80.9 KB Created: 2021-04-02 19:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 169fff948f6da3ba390dc5e9593f69da SHA-1: d378067debe35cb1fbe0b573cb127b8aaf82063c SHA-256: 396135ce59ff6a7f4755dd9c8a295953cb71cfb1efee0a03402b9816ca6d3caf
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan variant. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially malicious websites. The presence of multiple PDF_SEO_LINK_FARM heuristics confirms this behavior, aiming to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/award?keyword=arrival+of+the+queen+of+sheba+orgel+noten+pdf PDF link annotation
    • https://cdn.sqhk.co/gizoxemovefi/8ifwjhh/resident_evil_revelations_2_walkthrough_episode_3_barry.pdfIn PDF document text
    • http://help-service-support.com/lunovadotifedumutk2i8m.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/validar_assinatura_digital_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/iejjoid/godville_wiki_pet.pdfIn PDF document text
    • https://cdn.sqhk.co/bojodunaluko/hh4S4ii/69620262469.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/8Lpjaib/coin_pusher_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/hbjehaf/20237415244.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/SOgjjdI/mokudiwelibukur.pdfIn PDF document text
    • http://keysecret.ru/sizana60jnh.pdfIn PDF document text
    • http://dorightunion.com/89815002824ufjzp.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/15c7fd46-0182-4f35-9737-04823aeb81ef/ingersoll_rand_2340_oil_capacity.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_b5f9209478ad4d8dbf2a2486a430af7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6bef09-ee62-40fb-9e4c-1b5714674c25/best_morals_for_stories.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/kambi_katha_malayalam_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20af8cdb-8e4a-46f2-bde2-33477ad28f3d/21976523503.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_095685db786c46b09574c288f9332b14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf76b34-d683-4eec-af3b-de1d7769f8ba/chick_fil_a_processed_food.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_4091e64928b54aaeb97c7e34745aab2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/674f21ac-0288-4d65-8821-ae4c867c7396/romeo_and_juliet_quiz_act_1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 5620 bytes
SHA-256: 2245ef79a59b897db851b43f908c6642675360c8b11aa8320585d5dd549da6d5
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 11988 bytes
SHA-256: abfd5eb18e2e3fd04521f691cb73fed294bfce1a5975958f4ef3bc0f6f999576
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 16096 bytes
SHA-256: 292b67320f20e7e38814323bff47001ccb55b5eebb397aea8a254f3e91f57b87