Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4d621460be747d…

MALICIOUS

PDF

85.7 KB Created: 2021-04-10 09:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2e1a5f60ef57a3eb5cdb387f873be7 SHA-1: 1c7248e7182d2f0ebc9ceb82e4d6121695e55426 SHA-256: 7a4d621460be747d1270c9afa56f1eab584f132baf489c4546b20504b0ce8626
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'vilenefex.ru', which is likely used to redirect the user to a phishing or malware-hosting site. While the document body is heavily corrupted, the presence of external URIs and the overall detection strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=how+to+write+a+summary+strong+response+essay
    • https://wadodimimilupe.weebly.com/uploads/1/3/0/8/130873890/bidokexi_mewosizupore.pdf
    • http://megalit-korolev.ru/321293381381721x.pdf
    • http://whysmall.space/english_tenses_for_beginnersuervc.pdf
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/dutox_vaxatiz_zavita_sodamatunen.pdf
    • https://mifabawir.weebly.com/uploads/1/3/0/7/130776047/57c28b07a629.pdf
    • http://xbet1.fun/95800934731qwoed.pdf
    • http://nyvelsets.online/elektrometal_plus_metal_prices_georgian73qd.pdf
    • http://allwoman.site/william_shakespeares_romeo_and_juliet_1996_full_movie_online_freebgam2.pdf
    • https://cdn-cms.f-static.net/uploads/4402294/normal_6010ff51cd0e9.pdf
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/2517494.pdf
    • https://static.s123-cdn-static.com/uploads/4476936/normal_5fe251a6cbab5.pdf
    • http://pixell.store/delevibogocs97w.pdf
    • http://cabinetsly.xyz/anime_slayer_app_freen4qd4.pdf
    • http://you-bestshop.xyz/the_claiming_of_sleeping_beauty51fhk.pdf
    • http://maximizator.space/jakenijatupafazilanoxwo445.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ebfc8d56-548f-4a16-a686-cfafec411b77/examples_of_non_linear_stories.pdf
    • https://uploads.strikinglycdn.com/files/09ded855-102e-4245-9fd3-2f602b456b68/the_lying_game_season_2_episode_11.pdf
    • https://s3.amazonaws.com/fadadedezeker/berelapofizufoxemujofo.pdf
    • https://uploads.strikinglycdn.com/files/10353e35-d128-471a-8ad2-168119cf01d9/nusukonov.pdf
    • https://uploads.strikinglycdn.com/files/8ce9694e-1fc8-450e-b1a0-f1f7298162bd/gokovemogo.pdf
    • https://s3.amazonaws.com/fukezavazuj/xaxavinulodezafis.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_off000112ee.bin
5def7c62de77cf88c3ab3b595c967a4746dfb672eea1f0132745e73e96868533
pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 5264 bytes
font_01_sfnt_off000124d6.bin
58513a424ba7b43251e8391089b5476152bc85ce1725b2421e298aac27d1b49e
pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 10616 bytes