Malicious PDF — malware analysis report

Static analysis result for SHA-256 a045f6a45a8f20da…

MALICIOUS

PDF

74.6 KB Created: 2021-02-24 23:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 62e6c77fb4cca44d3c2321aa65b057bb SHA-1: d5cf81b36e3f4d2320c2bcc9146c643cd1411f05 SHA-256: a045f6a45a8f20da6caa2e39c636d54452b7ddd3564cff36c3bf1a78f5ea8539
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, 'https://crophysi.ru/strik?utm_term=march+of+the+titans+audiobook', appearing to be a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious purpose, as the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=march+of+the+titans+audiobook PDF link annotation
    • http://fabermanufacture.ru/temiwodulujidofoxoa30br.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/e6Km2K8/falipabifinelurojisunu.pdfIn PDF document text
    • http://remastacer.com/asure_id_exchange_manualom9ss.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/miYMgey/28631366307.pdfIn PDF document text
    • http://qupieasy.online/36737012815ox1d2.pdfIn PDF document text
    • https://cdn.sqhk.co/miloniwuwave/heQqvAG/totomilaw.pdfIn PDF document text
    • http://mail-autoscout24.net/881061110863mj4b.pdfIn PDF document text
    • http://getcreditcheck.info/craftsman_5.75_wet_dry_vac_hoseybgoy.pdfIn PDF document text
    • https://xanipopig.weebly.com/uploads/1/3/5/3/135345317/sojavofetixulo-gotiralegogaz-sanobilopowiku.pdfIn PDF document text
    • http://peripepotoj.iblogger.org/premiere_pro_free_download_full_version_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/GNbgqic/wordup_vocabulary_of_english.pdfIn PDF document text
    • http://zootime.store/weightlifting_percentage_table9jnzh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tidisel.epizy.com/new_moon_2021_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/eso_big_eared_ginger_kitten_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/50082839346.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/automobilista_tcr_mod.pdfIn PDF document text
    • http://kikumofesokir.rf.gd/habit_tracker_template_word.pdfIn PDF document text
    • http://nenunosulijud.rf.gd/kukonunofozoneripedit.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/collecting_like_terms_tes_worksheet.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_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 5284 bytes
SHA-256: ec77be08b5e40e788785e06fe158d5d032d7ad48d7aab7b0e9edf9a1bd5ff00a
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 11156 bytes
SHA-256: 5f55416cc4e02a24dc8b5785eec675cd7a31e00a7b8b471a5805bf92a92c9430