Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dd0dfe224935bf…

MALICIOUS

PDF

82.6 KB Created: 2021-03-20 23:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 33dd4614fbf93786552b2d22792ec0ec SHA-1: 906a43b710c36a5d73afed61e783be5551165265 SHA-256: c8dd0dfe224935bf5414bceaaac30671bc98488f17a907323db7772d1c311ad7
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/strik?utm_term=how+long+to+study+for+med+surg+certification PDF link annotation
    • https://cdn.sqhk.co/gidetixi/hfhggfa/off_road_racing_games_for_ps3.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/jghiWgQ/grand_prix_story_mod_apk_2._0._2.pdfIn PDF document text
    • http://sajitalunaded.22web.org/emiway_bantai_new_song_jump_kar.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/kofapaligesuri-bugivokubofab-xerakobipi.pdfIn PDF document text
    • http://dobafeser.66ghz.com/59626796964.pdfIn PDF document text
    • https://fujokexa.weebly.com/uploads/1/3/5/3/135304253/32651d3.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/djiiddc/building_services_network.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/9f89e722792.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/2857a18ea2ced.pdfIn PDF document text
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/pamodolawisowuvetife.pdfIn PDF document text
    • https://cdn.sqhk.co/beditakadiga/U3heBhb/wifi_analyzer_free_mac.pdfIn PDF document text
    • https://paladagaludoke.weebly.com/uploads/1/3/4/4/134460366/zikefidide_zazesalo_xivoto.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/hYjjhgd/siketid.pdfIn PDF document text
    • https://supadebev.weebly.com/uploads/1/3/2/7/132712355/9245797.pdfIn PDF document text
    • https://tiletemilowa.weebly.com/uploads/1/3/2/7/132710791/846268.pdfIn PDF document text
    • http://noxegasi.iblogger.org/68280972576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gidubivej.rf.gd/twin_xl_fitted_sheets_with_straps.pdfIn PDF document text
    • http://nigiragesowujow.epizy.com/because_he_lives_amen_lyrics.pdfIn PDF document text
    • http://widefafibix.rf.gd/bollywood_movies_online.pdfIn PDF document text
    • http://zekibinixosa.epizy.com/botswana_tourism.pdfIn PDF document text
    • http://tudutov.rf.gd/application_for_loan_letter_sample.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_2a03a6ca9ba44c9897c2cf9b8514e996.pdf?index=trueIn PDF document text
    • http://kefujamulewim.epizy.com/64579585826.pdfIn PDF document text
    • http://sobupedu.rf.gd/bamixijiwa.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_bf679271227546c988df7fc49b896ff3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 5496 bytes
SHA-256: 88ff4f845ab096132edcd102ac995f0f2f350e935e4bcdb672d457ab5a2ca069
font_01_sfnt_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 11384 bytes
SHA-256: 9b83cda604d8e0cb134210aa3ff3bf0a54c26f57a67037182c407354ff92245a