Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70d6cdfb933cdbf…

MALICIOUS

PDF

79.7 KB Created: 2021-03-18 04:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16d699e916e32133dbfde2eb8ae7d5f5 SHA-1: 7c5f4bb6ee12122ed23ef65304a0fc862a4056a8 SHA-256: e70d6cdfb933cdbf37251226370c96c05a4ef40be4e31d11fc460d4375a6df4a
156 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 of which point to other PDF files, suggesting a link farm designed to improve search engine rankings for specific keywords. The primary URL, https://vilenefex.ru/award?keyword=bsc+3rd+year+zoology+practical+book+pdf+download, is likely a lure to download malicious content disguised as academic material. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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-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/award?keyword=bsc+3rd+year+zoology+practical+book+pdf+download
    • http://starconflict-game.ru/bose_soundsport_earbuds_user_manual43wqf.pdf
    • http://clubstore.info/dexix63r8f.pdf
    • http://dommasters.site/what_do_you_mean_by_desktopyir3j.pdf
    • http://magazok.top/navy_fitrep_bullets_for_chiefsx66u3.pdf
    • http://teenagetutor.net/indian_romantic_novels_in_english_free_downloady3r7i.pdf
    • http://trackengine.host/3792731229ukatq.pdf
    • http://bluebadge-support.com/5649250930r80fa.pdf
    • http://superheatbelt.xyz/fudodoranusudoxijoxv4at.pdf
    • http://igcopyrightforhelps.com/making_daphnia_cultureuww7p.pdf
    • http://montana-media.com/kilulojodusowokotisaluto7cpog.pdf
    • http://alkim.xyz/gageramoxowa7hi.pdf
    • http://remontlegko.info/life_fitness_95t_discover_se_treadmill_wifi_ready13lq8.pdf
    • http://hookup673.site/dasuposizedekumnj62.pdf
    • http://segwaywheelchair.ru/703124194255utjb.pdf
    • http://fb-pageunderreview.com/zombie_catchers_apk_mod_2019jtn3b.pdf
    • http://lp-consalt.ru/gutatagisawenudemiporitjhsa.pdf
    • http://vezerfa.xyz/71222174712zyeaq.pdf
    • http://8gusevshop.space/ezreal_guide_op_ggiks78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_7f9314118b2f4111a9d05153d9a77b80.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_49080a3e35d242f2a946d1c114474b97.pdf?index=true
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_683d53a6958f44e1b0a8a29242c03b5a.pdf?index=true
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_365a46cb19404b4092c38395fe340d01.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_a5d253e62e0d45ba8ca6414b16b181e3.pdf?index=true
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_4ac6835dd84a46079ed5acab8931c607.pdf?index=true
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_bae9b2781b444b9cb710e554bf2428d8.pdf?index=true
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_465f912d012a440c8aa0eb29e66105cd.pdf?index=true
    • 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_off0000f53a.bin
f9e642daffe3fce0af738815b6a3f38f07b8a62d506f957158dc629296c1b551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 5984 bytes
font_01_sfnt_off000109cc.bin
f2575498c063364fbbf1f07a9fe6d8c94a102552da7d8dae4e6b42c192807896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 11348 bytes

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