Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ee8a046c0a61bb…

MALICIOUS

PDF

80.6 KB Created: 2021-03-04 07:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c7347a18afff088d7917f44f0e0b8f51 SHA-1: edca71132ddc5b59dc4b689323627d8825725916 SHA-256: 92ee8a046c0a61bb0b373b9a7eebec8dbdc87468403a9abde07fb18a24b2bc2b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://ponafet.ru/123?utm_term=how+to+write+an+essay+for+sat PDF link annotation
    • http://meetcabinets.xyz/ruzumekameliwunujasomuli5w8.pdfIn PDF document text
    • http://wowitaly.pro/directv_phone_number_technical_support45ezt.pdfIn PDF document text
    • https://nopefulewipedu.weebly.com/uploads/1/3/4/3/134314682/vujekowekurov.pdfIn PDF document text
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/9a40bcea9ee95.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/pokemon_ultra_sun_shiny_breeding_guide.pdfIn PDF document text
    • https://pinababinazu.weebly.com/uploads/1/3/2/6/132695354/8ca3a260179a4f.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/how_to_learn_graphic_designing_on_your_own6m2bt.pdfIn PDF document text
    • http://frukt.space/teamfight_tactics_league_of_legends_strategy_game_iostil8h.pdfIn PDF document text
    • http://fkpravo.ru/99518741163jofhz.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/e00fd473bf29392.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/306628.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/wofajibakujudad.pdfIn PDF document text
    • http://andyhong.blog/4176546209xkxtp.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/how_to_describe_touching_someones_face.pdfIn PDF document text
    • http://2020coupons.info/93409603232pzop5.pdfIn PDF document text
    • https://merudaxesu.weebly.com/uploads/1/3/1/3/131383629/9968301.pdfIn PDF document text
    • https://lebugaboforov.weebly.com/uploads/1/3/5/9/135976333/lejezimegud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutejaxevewef.myartsonline.com/selenium_java_tutorial_youtube.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_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 4884 bytes
SHA-256: 1f1c05a33f78926d8e70bd35018c52f92f0c33434cf41c7ec4e278eeb670b1dc
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 11092 bytes
SHA-256: 4bf9ba183e9c65fd453932747d542a8cb44fc563ac1cc7e599ded7840c8bad7c

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