Malicious PDF — malware analysis report

Static analysis result for SHA-256 c773a42d76e7bd27…

MALICIOUS

PDF

79.8 KB Created: 2021-04-27 12:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: adcd393d906dbdaf78894bf5b3500698 SHA-1: 295f76915bd43f21273f2ceab9f3e8a336feb783 SHA-256: c773a42d76e7bd27c1a972c46575ff55c5a973b0cea0270463a3b4aa5650a01c
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. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', and the presence of external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=how+to+get+disney%252B+on+apple+tv+gen+3 PDF link annotation
    • http://wonikugemozu.iblogger.org/cancer_de_colon_fisiopatologia.pdfIn PDF document text
    • http://gobuweba.22web.org/esp32_datasheet_en_espressif.pdfIn PDF document text
    • http://life-news.tech/what_does_management_skills_meanmsyae.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/peweko.pdfIn PDF document text
    • http://favanitum.iblogger.org/which_harmonica_should_i_buy_for_beginners.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/68826163604.pdfIn PDF document text
    • http://badge-verification-center.com/how_to_connect_wireless_plantronics_headphones_to_laptopc807r.pdfIn PDF document text
    • http://alkim.xyz/xutotatu3pm7j.pdfIn PDF document text
    • http://apkweb.net/15119624515qe7n4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7257f12f-8319-44d9-ab65-f61d8a409d36/dagenijalanelotavezuxed.pdfIn PDF document text
    • http://lawurukipajuxe.rf.gd/42873828534.pdfIn PDF document text
    • http://lotifajabam.epizy.com/balochistan_issue_and_its_solution.pdfIn PDF document text
    • http://zuvidetalenaras.epizy.com/zivaxamowetadoxiritutega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3415b9a5-55c8-4745-bc41-b1515b55e3ae/26672537557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71472a75-a980-420c-841c-3979df4af3dc/hp_elitebook_8540p_driver_pack.pdfIn PDF document text
    • http://juvevojoke.epizy.com/remove_watermark_foxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3347ca-3cfe-414f-ab38-a88a96a7bbfb/direxofis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b121dfc6-0bf3-4b26-9d1a-428595fe0eb6/briggs_and_stratton_engine_specifications_chart.pdfIn PDF document text
    • http://lawazujazigefon.epizy.com/fivugofoxoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f4e6e2-d863-491d-b442-f0f16e1ffd5d/95003475558.pdfIn PDF document text
    • http://figelaziri.epizy.com/dunuwasik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 5412 bytes
SHA-256: 1c524e1150e68cb591ab7ad2c52aa784d02817dab618fed6f3e0ca9d66b7204c
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 11196 bytes
SHA-256: b47adfa4cae2bb32b11658aa05cd9e9a7516e781c645aec83bfea11041bbb1c3

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