Malicious PDF — malware analysis report

Static analysis result for SHA-256 137499a9c1ab3cb6…

MALICIOUS

PDF

80.4 KB Created: 2021-04-24 03:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 931568366e4799379afb544da208167f SHA-1: 97d42964334c88269a04fd761290a1cb3ae0d52c SHA-256: 137499a9c1ab3cb695246a91dccd2cee27fca73f3926cb3e06555bbab42fa2a0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a cloud-document share lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://xezojetit.ru/strik?utm_term=software+project+management+bob+hughes+6th+edition+ppt PDF link annotation
    • https://cdn.sqhk.co/pimibopugugo/gleieXQ/deep_sea_creatures_list_acnh.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/42277024128.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/igybbvC/city_car_driving_simulator_3.pdfIn PDF document text
    • http://gobitujesan.scienceontheweb.net/changeling_the_dreaming_player_s_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/ogcHrym/free_photo_special_effects_programs.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/36388043678.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/bZnhgJX/pudesasujigasazas.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/wgfoTii/download_zombie_assault_3_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/Kghchbo/music_with_amazon_prime_membership.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/21633239123.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/z5hd9c2/ice_hockey_league_england.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
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_f337716f73254e25a2d35c3ee5d8c9e7.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_8dfd659e47c44e76a1ada45040e6fba0.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_7e152f39aa3a41feaedc71dca27907e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/xetupabebunumox.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/female_criminal_attorneys_near_me.pdfIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_fb69d100ce3d45a4ae175583a28b2eff.pdf?index=trueIn 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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 5984 bytes
SHA-256: db8c8928e48f5e866f19b72c264ae87bf10a4c8392355e129078cf00b094bcf9
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 11380 bytes
SHA-256: 95778211af03e57121dcc1445a0d3a1b2bcc08888268265d336ecb5026d532a7
font_02_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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