Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc1403c31d1f4a8…

MALICIOUS

PDF

83.3 KB Created: 2021-05-09 19:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4486e7fb380d08d89aa4db876e4b43e5 SHA-1: efa4cf9cf2abf544e10cef80bfb402dca280a923 SHA-256: afc1403c31d1f4a89956d7aba537eac1a61dc6fd376003d99f852a2c6f382ddb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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://kuzutuzo.ru/strik?utm_term=opencv+with+python+by+example+download PDF link annotation
    • https://cdn.sqhk.co/mumeriretepi/aaamHgj/leap_day_william_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/hagfzjc/download_game_nfs_heat_studio_android.pdfIn PDF document text
    • http://ripelavezomosiv.iblogger.org/8203475507.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/c4rjbAG/vogitejetulikaram.pdfIn PDF document text
    • http://towonededuv.medianewsonline.com/hamartia_in_oedipus_rex.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/vobejixuzizurasu.pdfIn PDF document text
    • http://robadepid.iblogger.org/plasmodium_life_cycle.pdfIn PDF document text
    • http://bawoputameded.iblogger.org/writing_equations_in_latex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reguturutomasut.rf.gd/how_to_earn_money_in_stock_market_philippines.pdfIn PDF document text
    • http://dirulibas.onlinewebshop.net/xogapu.pdfIn PDF document text
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_170e5795ecb740bda080c1062ee78754.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5337a06-7d3e-4735-9154-d9aa9b5fd0ea/2976416788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc2b612-98cb-4171-a270-5eae1e57fab9/how_to_do_price_volume_mix_analysis.pdfIn PDF document text
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_584c87ed25a04de895e5a27dabe33551.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_2059bee864a346d7ad6e970df041f819.pdf?index=trueIn PDF document text
    • http://simatan.epizy.com/broken_angel_song_320_kbps.pdfIn PDF document text
    • http://segimoto.myartsonline.com/fazutinepirobifafipikopej.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_3752eb25c5764a3f88cde20ab951c614.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b99bb9-5204-4650-8e9a-4d7695081701/75498230429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32c96ce-d6ec-4a6f-aa93-6cdd937e489f/why_rich_are_getting_richer.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_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 5528 bytes
SHA-256: 25a2ae9d11fa0a5d25ffeaaefab63a470a92e79dad5ea68b3fcc63cfd7526277
font_01_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 10916 bytes
SHA-256: c3ffadce6a89026354b35c07e43a814989c375abf2b50f5614a58bb337941313

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