Malicious PDF — malware analysis report

Static analysis result for SHA-256 836d0c69fd7b7c94…

MALICIOUS

PDF

85.7 KB Created: 2021-04-20 03:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 71e8031effce28326b86ea7a2cc0c2af SHA-1: fd6f7c7c3df44711336c16e9c61d649c4bec5a16 SHA-256: 836d0c69fd7b7c945e3e664c9ce5d80ac8c160d9b158cf9ad80374a75744aa39
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable or suspicious domains, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://kuzutuzo.ru/strik?utm_term=why+is+my+lg+dishwasher+not+turning+on PDF link annotation
    • http://datingdate.site/jasitowudorewurituwazopulaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_603e2c5d37b41.pdfIn PDF document text
    • https://surarapumo.weebly.com/uploads/1/3/4/3/134305151/15e37aead53e.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/8yihcpK/java_programming_mindtap_course_list.pdfIn PDF document text
    • http://titanof-filtr.ru/tirolavevozoxoxujx8caq.pdfIn PDF document text
    • https://powizosiki.weebly.com/uploads/1/3/4/0/134041047/nebutifaw.pdfIn PDF document text
    • http://item-mask.top/zenakov6qjuy.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/vujunegaxosesilagedarew.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/hghdRhc/hobby_lobby_store_pickup.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/1390b.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/read_person_like_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_602549e3304ca.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/c348d4e595e1453.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/mamogidesod_tapuguju_raxuwatobip_newotemogo.pdfIn PDF document text
    • http://cancandance.org/blobby_volley_freewvfs7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fezafugalofibid.epizy.com/book.pdfIn PDF document text
    • http://dowijasimenazo.epizy.com/wrong_turn_movie_tamilrockers.pdfIn PDF document text
    • http://tatoguninorevem.epizy.com/33706591910.pdfIn PDF document text
    • http://luxoxuwaf.epizy.com/vijilefunopamokala.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/altec_bucket_truck_parts_for_sale.pdfIn PDF document text
    • http://vuloroluget.rf.gd/dewikifezafebevop.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 5328 bytes
SHA-256: dca5f1df955de2e909ea2a7a9cc404535bb55d48c4d6ee0ae0f0def0d7ec08f5
font_01_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 11084 bytes
SHA-256: e3bd8d152f903083041fc0d022925f6149380cc9837c07781d4657c559fe33ed
font_02_sfnt_off00013941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13941 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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