Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e15f7f38efdbdeb…

MALICIOUS

PDF

75.4 KB Created: 2021-05-17 02:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9cb28bf947f78e38473a414c00165da SHA-1: 109403fa93e62722ddea0c0a6ec27e02ac6a8f1f SHA-256: 3e15f7f38efdbdeb44235c6ae8aab11ef63d9132f06aca4e629c129177cee7cf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=how+to+reset+a+electric+hot+water+heater
    • https://cdn.sqhk.co/vimewiki/hfjdEgd/70s_disco_music_mp3_download.pdf
    • https://gasagegote.weebly.com/uploads/1/3/4/3/134333211/abc74d1bc.pdf
    • https://cdn.sqhk.co/budijapa/ihcmygf/twisted_tea_flavors_in_canada.pdf
    • https://cdn.sqhk.co/mukujoripu/OyfhBge/colorfly_dark_skull_coloring_book.pdf
    • https://cdn.sqhk.co/gabebutiz/iajcgcZ/surufiva.pdf
    • https://cdn.sqhk.co/jarixizotib/dZKpBFH/download_game_hollywood_paradise_hack_apk.pdf
    • https://cdn.sqhk.co/vomemubevu/ghfgegc/1._1._1._1_faster_safer_internet.pdf
    • https://cdn.sqhk.co/gapekozuwa/jjfidji/hearts_card_game_live_online.pdf
    • https://pezibife.weebly.com/uploads/1/3/4/3/134376528/9235974.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vosimalume/writing_numbers_in_spanish_worksheets.pdf
    • https://s3.amazonaws.com/mivokozibu/how_to_give_notice_to_landlord_termination_of_lease.pdf
    • https://s3.amazonaws.com/dugibabafod/eoc_practice_test_algebra_1.pdf
    • https://uploads.strikinglycdn.com/files/5d87cb5c-ccd2-43c7-b1fa-85f51c3e1e5f/tomtom_go_500_battery_replacement.pdf
    • https://uploads.strikinglycdn.com/files/f25f783e-992e-47b2-b696-49798510d138/wugifize.pdf
    • https://uploads.strikinglycdn.com/files/6f867706-5bd3-4185-b4ab-d2dce10ff28a/champion_generator_9000_battery.pdf
    • https://s3.amazonaws.com/lolaritemukole/embolizacion_de_aneurisma_cerebral.pdf
    • https://s3.amazonaws.com/sukobogixe/free_math_worksheets_grade_5_multiplication.pdf
    • https://s3.amazonaws.com/pisik/tadakobexekedosewo.pdf
    • https://s3.amazonaws.com/fukezavazuj/el_partido_liberal_reformista_aboga_por.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c1.bin
aa9b93e858746a4803c7b90cbdb9b3bba02e4cd80dbf527b3a560b88b6b65271		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 4940 bytes
font_01_sfnt_off0000f891.bin
1d70a72f6497336086fe5ba717410bedaa994ea0fdb3480fc72dfe06ab956c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 11188 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.