Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e342a33795059ce…

MALICIOUS

PDF

77.4 KB Created: 2021-02-19 22:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7d932400b2916a182289e5096ce6961b SHA-1: 2528418f0a190be85a09fa53958f55801e15ba44 SHA-256: 8e342a33795059cef8c4454ae1a8660021f0100da625d5a7aa542042298273e4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=isotope+practice+chemistry+worksheet+answers+with+work PDF link annotation
    • http://acgmgroup.ru/jevivorosorifapcl2gc.pdfIn PDF document text
    • http://smirno.life/pathfinder_druid_archetypes_guideko910.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/etDPZgx/vuninemawigapu.pdfIn PDF document text
    • http://rukawagamijo.iblogger.org/chokher_bali_epic_song.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/iahgLhR/dead_paradise_hacked_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/aXgjggS/zombie_shooter_2_pc_game_free_download.pdfIn PDF document text
    • http://doorstepcomputers.com/jutas_complete_textbook_of_medical_surgical_nursing_free_download51xvb.pdfIn PDF document text
    • http://omerkatanalp.com/tnstc_bus_game_free_for_mobilehgvsf.pdfIn PDF document text
    • https://sibuzowad.weebly.com/uploads/1/3/2/8/132814892/e9664b938718000.pdfIn PDF document text
    • http://voztrans.ru/88470268022ae1ol.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/geihZji/zaxufomezodujesefefekuzi.pdfIn PDF document text
    • http://fanexaxujuto.22web.org/bajum.pdfIn PDF document text
    • https://dojapoxozali.weebly.com/uploads/1/3/0/7/130775013/resavilez.pdfIn PDF document text
    • http://instapodarok.site/superhero_in_flightxwmah.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/f9jjifW/jegogiwigadum.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/play_tamil_hd_movie_freeyvsmu.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/iKjgmjd/vedogidudekawedor.pdfIn PDF document text
    • http://indohealth365.online/kofeliduba7e4r3.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hdjiMkr/quran_arabic_and_english_translation_app.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
    • http://pidusuzelaju.epizy.com/what_is_african_swine_fever.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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 5124 bytes
SHA-256: 880d744b637ffaa487dc8fb84797d82c7e24964e695c87ac63d9814c093b6b57
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 10720 bytes
SHA-256: 87526adf31cbb691f17cbc3ae5f98e8e8dfac36fbda7f18bbbdde36e54b3d0c0
font_02_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361