Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1e3581f1abab39…

MALICIOUS

PDF

91.9 KB Created: 2021-03-28 21:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 77be233c8c1418f195ec055b80a02020 SHA-1: bde6c2b13c8a5fd059e97d7e7851573e78bd0189 SHA-256: 9a1e3581f1abab393b618d701b65136e58a144828156018e3e0d309e0975b922
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zajinet.ru/123?utm_term=bleacher+report+college+football+predictions+week+12 PDF link annotation
    • http://rrrrkkkkk.space/81698474616n225f.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/21555160182.pdfIn PDF document text
    • http://juponuziwotaga.mywebcommunity.org/animals_and_their_habitats_chart.pdfIn PDF document text
    • http://esclub.pro/bametu7eg62.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/82830170590.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/all_star_batman_robin_the_boy_wonder.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/1338678029.pdfIn PDF document text
    • http://sandiego-podcasts.com/pukutixajut0ufa.pdfIn PDF document text
    • http://prequester.online/2005_chevy_malibu_headlight_bulb5hxvg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/649d1e16-2adb-4732-92a4-e961ac049f5a/faxesotenudo.pdfIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_a04d922b275c44428bfe757f28224b51.pdf?index=trueIn PDF document text
    • http://tagijonegularol.myartsonline.com/the_cabin_in_the_woods_the_official_movie_novelization.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_1b41ef103bd64aa1830a3d780b17551f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd98b64b-eb92-42ad-8b37-7181b5936a1a/how_do_i_make_a_smoothie_with_frozen_fruit.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/kukowe.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/vasekejagupe.pdfIn PDF document text
    • https://183cab0c-2e2b-44e6-b55a-0f82cb58e578.filesusr.com/ugd/133137_7ff6efd97f674c00a4e1200c03c0aff9.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_e81e6c3b1be9411e908b06183c0f7f02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/667b3ebe-444d-4706-a690-5c2c7b043b81/pokemon_card_books_amazon.pdfIn PDF document text
    • http://bizedesaxifu.onlinewebshop.net/4699629503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543f759a-472e-4ce0-9f46-ab1e142570ee/dremel_multipro_395_type_5_parts.pdfIn PDF document text
    • http://tameladizikep.atwebpages.com/sudisev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 5732 bytes
SHA-256: 56492be5c0ba459f9ffdb94e10ae84a3209856be4dec34a546d9d3e23a45e62a
font_01_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 12408 bytes
SHA-256: 47177694a86470a7b91bb2b74ced7b1901ce4092c6df10c92ad8e10501f54a1c
font_02_sfnt_off000153d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3