Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa44526998c328cf…

MALICIOUS

PDF

85.3 KB Created: 2021-04-24 21:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cbbd7aa7c96775cc35f8455e9f91f276 SHA-1: 6889bef384ddb178c0fe1945add8d22f8c641365 SHA-256: aa44526998c328cf974fbf0b0c6017a24a8bc23b171ce9ebe87f8b5c466d63e9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The presence of a URL with a 'utm_term' parameter suggests a phishing or SEO-spamming campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/strik?utm_term=what+is+the+price+of+samsung+tab+a6 PDF link annotation
    • http://ruvikuvi.mywebcommunity.org/up_board_exam_date_2020_class_10.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/vihjadA/falodutalobinifakuzapa.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/homelite_2700_psi_pressure_washer_gun.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/2giChsn/perceiving_others_forming_impressions.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/ca9232f5ae64d.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/aggcicq/52107466491.pdfIn PDF document text
    • https://cdn.sqhk.co/wixumenez/E5vUUij/58671800700.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/ibghheJ/joplin_weather_tomorrow_hourly.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/6Dnhege/tennis_clash_3d_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/hptOieh/gods_of_rome_game_offline_free_download.pdfIn PDF document text
    • https://zitakutuseg.weebly.com/uploads/1/3/5/9/135994262/bevididaguj_dexuvimutuv_fadeg_tizomevomora.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/90414087995.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/hiyfPij/terranova_test_prep_grade_4.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://s3.amazonaws.com/xijuxosisomuna/4249410740.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/73476218167.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/mcat_practice_questions_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f335c8f-5368-4557-9f4d-7d8cc57e4169/wuvemiwosekegozuxaziwuxil.pdfIn PDF document text
    • http://fekejuw.atwebpages.com/cbse_class_12_biology_evolution_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4755a0fd-712e-4c1b-acac-9b1d4fa3bd3f/php_rest_api_server_example.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/fesatoze.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/oxford_dictionary_english_to_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540da846-ae92-4295-aa21-ff1ca908959e/gasasubudekesevofotexel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b34df1-e3a2-408c-9948-bf15711981a9/tom_clancys_jack_ryan_season_2_episode_2_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/fikutix.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_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 5588 bytes
SHA-256: d976ae19c670b4e000e5ce8c06a43d7918639ec1b0717fb6eb8846871cfdc2a5
font_01_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 13228 bytes
SHA-256: 20a157390201eed289afbaeaaa801face9733eaf14d2d4c4736e1870476fb697
font_02_sfnt_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34