Malicious PDF — malware analysis report

Static analysis result for SHA-256 072211495df98308…

MALICIOUS

PDF

76.3 KB Created: 2021-05-12 12:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8b99cc78e7e2dc41ad610d596c94c47b SHA-1: 3f201c5ab8add51fd3b43c742b6c53974f0ab8d4 SHA-256: 072211495df98308c87119f13213890771b2d84b4ebbeac656e13301b66b2834
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded URLs pointing to suspicious domains, one of which is used in a link farm heuristic. The document body, though heavily obfuscated, suggests a lure related to a contract template, which is a common phishing tactic. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest it's used for phishing or to download further malicious content.

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://xajibur.ru/strik?utm_term=formato+de+contrato+de+arrendamiento+de+casa+word PDF link annotation
    • https://cdn.sqhk.co/bupewazadufa/geUjdgg/98720568471.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/a4hf8nq/lucky_songs_mp3_telugu_lo.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/what_is_the_meaning_of_the_song_defying_gravity.pdfIn PDF document text
    • http://tideboweped.medianewsonline.com/manifestasi_klinis_hepatoma.pdfIn PDF document text
    • https://cdn.sqhk.co/ketodumukiv/kijjfgj/xitabivukeroji.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/hbkhcgc/idle_dice_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/naritiba/ARhghiw/76777978260.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/microsoft_access_2016_requires_visual_basic_for_applications.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/MPMigjb/happy_fall_yall_wallpaper_for_iphone.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/6b51f976-c758-4f98-bb3d-cfcfad8475de/piwolebunaboge.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/michelin_guide_japan_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4704a7ed-afc8-4ff2-b785-c64269c86a1c/basic_drawing_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8996756-3766-4dac-b877-ca86c73dfa50/35775755716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5e39c9-2049-44ee-af73-e1a394270b8d/sinibefelujuvimam.pdfIn PDF document text
    • http://kamigawox.atwebpages.com/speak_business_english_like_an_american_free.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/lulamavinorixosokidex.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/70572955164.pdfIn PDF document text
    • http://xirofapinowud.atwebpages.com/gramatyka_angielski_matura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a63467-e525-4ea5-9541-96bdc02f949d/1917352065.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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 5100 bytes
SHA-256: 5abe8d42cae1e30de1c113a1fcea7d2331d9195d87a819071096a65fd3df5663
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 12500 bytes
SHA-256: 6e5104c95cb6d8ea9e76cf8ad81474bdec71c69ef042a88164584594fea2e720

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