Malicious PDF — malware analysis report

Static analysis result for SHA-256 50921378ef019776…

MALICIOUS

PDF

80.7 KB Created: 2021-04-20 22:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 195c31502b94ea4101b3b52256068c5e SHA-1: 6a46f7205dfbecda729a5e50aeb75180b6584769 SHA-256: 50921378ef01977631245ea40b357cb358129680ba5f7a29f9798c2c4c2a2950
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://yafferge.ru/strik?utm_term=how+do+i+turn+on+my+lenovo+wireless+keyboard', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to Lenovo wireless keyboards. The presence of numerous links to disposable hosting and the ML classifier's high confidence score indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=how+do+i+turn+on+my+lenovo+wireless+keyboard
    • https://cdn-cms.f-static.net/uploads/4404297/normal_602feb638503a.pdf
    • https://cdn.sqhk.co/lexebogefaj/jigcBge/aulas_de_ingles_portugues.pdf
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/bupalumepeje.pdf
    • https://futinubub.weebly.com/uploads/1/3/5/3/135328842/25294214331f.pdf
    • https://cdn.sqhk.co/jomenuluz/ti3tPjg/27728470625.pdf
    • http://jokojujut.medianewsonline.com/best_conversion_to_kindle.pdf
    • https://cdn.sqhk.co/feguzuvubut/hgdzK62/folagujokiruriliv.pdf
    • http://dupuladusudired.mypressonline.com/zalesomoxekef.pdf
    • https://cdn-cms.f-static.net/uploads/4464301/normal_60366d5197a0d.pdf
    • https://cdn.sqhk.co/nexasolonit/RCrUhbm/mukujozuzumabipiw.pdf
    • https://pixufudevolu.weebly.com/uploads/1/3/0/8/130814466/vamebuzubisuxim_siviworesiwutu_gunig.pdf
    • https://xosofanukofupa.weebly.com/uploads/1/3/4/8/134879033/18edeffef419bf2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fojaxexino/vokuwifudituxe.pdf
    • http://sugimukijofi.rf.gd/sideshow_musical_performance_rights.pdf
    • http://rozakoxufe.epizy.com/pimidatofekitasakubevivok.pdf
    • https://s3.amazonaws.com/vifusupegiza/firefox_apk_for_android_2._3.pdf
    • https://s3.amazonaws.com/voropa/ravumepobakawoni.pdf
    • http://loluwoje.epizy.com/11211173239.pdf
    • https://s3.amazonaws.com/nilafafakem/cuisinart_classic_toaster_oven_broiler_manual.pdf
    • https://s3.amazonaws.com/kavifunaruvi/padi_rescue_diver_video_download.pdf
    • http://mewudupite.epizy.com/descargar_asphalt_6_para_android_apk.pdf
    • http://jovurafop.epizy.com/ziredalolifibefijikulonol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f2.bin
9cf65a52599902af9243c476157490627e035671e3b44fe7b926e3c28992044d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 5388 bytes
font_01_sfnt_off0001063a.bin
7c2f3f7bb60da8032bb395d10e5b70d812f345dc8f4103d2d6f41b5d6834a5d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 1952 bytes
font_02_sfnt_off00010f9f.bin
2bec72666116be8df52ce65fe0254dd434d9646f6f54397f413aab0b3974861d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 10904 bytes

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