Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42df83d4ae27a48…

MALICIOUS

PDF

82.5 KB Created: 2021-05-05 18:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 67036b2d644dbbb303bde06658fd9f2b SHA-1: cd1af03300d25788248e2669aaa46bbb6c9d49e2 SHA-256: f42df83d4ae27a488ecb5a8da6b5b5c5745f0b06ec536d84c88f25dfcf360dcc
146 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=boy+scout+kayaking+merit+badge+workbook PDF link annotation
    • https://cdn.sqhk.co/goluxewimabu/j1giric/steam_tabletop_fest.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/hfhaqib/bumik.pdfIn PDF document text
    • http://leqqurint.online/baby_girl_names_that_start_with_calp5mz5.pdfIn PDF document text
    • http://how2clever.com/13700064237lin2q.pdfIn PDF document text
    • http://soldatskaya6.ru/ropopejakuguzesubuzodpa4l.pdfIn PDF document text
    • http://tortomsk.ru/576209267590u0e6.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/iyghqVJ/guvituv.pdfIn PDF document text
    • http://indital.fun/powerpoint_storyboard_shapes_templateslgiu5.pdfIn PDF document text
    • http://iwhite.space/on_my_way_lyrics_video_mp4tfftk.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • http://inglassrus.ru/danby_window_air_conditioner_12000_btu_reviewucc6l.pdfIn PDF document text
    • http://amorexpo.com/tidibinuguxn6t0.pdfIn PDF document text
    • http://lufawobakisi.22web.org/jibufujap.pdfIn PDF document text
    • http://pufexob.iblogger.org/nativist_theory_of_second_language_acquisition.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/tatakakuwito/dI0GbAf/20434884145.pdfIn PDF document text
    • http://arnautmebel.ru/mr_coffee_4_cup_coffee_maker_instructions0x92i.pdfIn PDF document text
    • http://hytri.com/how_to_pair_jbl_wireless_speaker05ove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nedepufeto.epizy.com/goxel.pdfIn PDF document text
    • http://noratev.myartsonline.com/physics_textbook_class_12_maharashtra_board.pdfIn PDF document text
    • http://puxebipupaluna.rf.gd/penumobitizalemi.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/kavikuzojoxubedumi.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_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 5672 bytes
SHA-256: 2e5d01432173d99d113a66778cb2251cc7d78945174454ed2af469847f472e7d
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 11352 bytes
SHA-256: e41f99c2f5cd292587aa932dc14e652b0516475e38ab84aaab915de48317c115
font_02_sfnt_off000126e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E8 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501