Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1d96eeff547d7b…

MALICIOUS

PDF

86.8 KB Created: 2021-04-25 06:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e79249119432fc3fb187f7e66340a3d SHA-1: 683183e09a0483f99544eb9db1bc78e222c46309 SHA-256: ba1d96eeff547d7b6f7ffa6e3ec091b0f885b9ed6082b824e943235adfa8fd78
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of malicious intent, potentially leading to further compromise or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://zajinet.ru/strik?utm_term=theme+of+alicia+who+sees+mice
    • https://cdn.sqhk.co/nejibija/ihmihDs/jewowuget.pdf
    • http://xogavuw.medianewsonline.com/prepositions_of_place_worksheet_esl.pdf
    • http://mikovil.mywebcommunity.org/how_to_ace_the_technical_pilot_interview.pdf
    • https://fozafilamo.weebly.com/uploads/1/3/4/3/134314768/dowufuzawu.pdf
    • https://buritozube.weebly.com/uploads/1/3/0/7/130775753/zedekemilexa_zulokupapuzi_wupusanuvixo_pulozuxesexi.pdf
    • https://judunuxazivu.weebly.com/uploads/1/3/1/4/131453245/fidodufewujop.pdf
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/bibivujojezute.pdf
    • https://lefonoduri.weebly.com/uploads/1/3/5/3/135324857/xaxagisogizumu.pdf
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/pituzekotafuvev.pdf
    • https://cdn.sqhk.co/rebamomidaw/iI1V4MP/kutonekoxipopebi.pdf
    • https://cdn.sqhk.co/surodamiz/Ylhdnte/crossword_tracker_permitted.pdf
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/8690557.pdf
    • http://gokawojop.scienceontheweb.net/delhi_metro_map_2020_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4446651/normal_602557420fec8.pdf
    • https://cdn.sqhk.co/xesofosirija/dCkjUha/hockey_wallpapers_for_iphone_6s.pdf
    • https://cdn-cms.f-static.net/uploads/4385859/normal_606a993ed148f.pdf
    • http://widonatozeg.mypressonline.com/suffixes_worksheets_grade_2.pdf
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/8955502.pdf
    • https://cdn.sqhk.co/bufudoraxala/jarig9n/sword_art_online_alicization_rising_steel_wiki.pdf
    • http://fukazab.mywebcommunity.org/system_analysis_and_design_course_outline.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nununad.myartsonline.com/stock_market_trading_hours_day_after_thanksgiving.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_off0001085a.bin
420f01410d5722d11fa2aab98bd7c9614aace5452aafc84755bb7d475e5eddbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 4668 bytes
font_01_sfnt_off00011848.bin
e690cb20eaa6758bf626a363061d89870d8262721a2e4f531526fd3874eee8a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 11588 bytes
font_02_sfnt_off00013f9b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9B 4324 bytes

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