Malicious PDF — malware analysis report

Static analysis result for SHA-256 832bace8839408dd…

MALICIOUS

PDF

72.2 KB Created: 2021-03-24 15:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8bae5a3d515bdde67e04ba0d0093cf5f SHA-1: de975f868b9377fff0c2424946697739e68f2d8c SHA-256: 832bace8839408ddbb53dc32f0336c37b34fb0828aef59c676cc79dd29232d75
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and likely phishing-related. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Exam english b1 grammar pdf'. No scripts were extracted, but the PDF structure and URI patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=exam+english+b1+grammar+pdf PDF link annotation
    • https://cdn.sqhk.co/vazoguzo/QidiYT0/ramuzale.pdfIn PDF document text
    • http://pokypka.xyz/commando_3_game_pcojm2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_6039d03e96b36.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/hzihMhl/mowim.pdfIn PDF document text
    • http://austritkfa.com/zefukoxirotevibapefogegajufsfi.pdfIn PDF document text
    • http://outputqwvk.space/zejubokelezefewera62mxn.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/Cjc5hjC/damanuxusanosaxe.pdfIn PDF document text
    • http://micrometer25bill.site/wofaganepasumemegujinufcd76n.pdfIn PDF document text
    • http://teasmall.space/zeforesiselujadawuvovv9kzt.pdfIn PDF document text
    • http://mihetos.xyz/worksheet_30_properties_of_acids_and_bases0tv3v.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/uvx9fge/galaxy_movie_theatre_carson_city.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5fda543b291b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_6009dc01855a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalowakudedakov.rf.gd/cara_multiplayer_di_gta_sa_lite_android.pdfIn PDF document text
    • http://suvokejixu.epizy.com/zafotubepamimumewazawuj.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/vofikefupuxamupib.pdfIn PDF document text
    • http://simipibenafar.epizy.com/android_studio_old_ndk.pdfIn PDF document text
    • http://jotinonikudodi.rf.gd/john_deere_316_snowblower_belt_size.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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 5672 bytes
SHA-256: 8614cc5df25d4368718fd65625d981c370485b5246f561e079933f6bf2792ac1
font_01_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 10672 bytes
SHA-256: 5bf5aba4b59368885fc89dca789904365fffb22800129f02ad1f90eca28397aa

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