Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01743e6d164d59d…

MALICIOUS

PDF

100.5 KB Created: 2021-04-26 12:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1ff5b8c65965e96a3c8b745eedb93c2 SHA-1: 097c1d03c8d67ac41befc43d2551452dd1ffc6af SHA-256: c01743e6d164d59d4f97b299a9bfb023c31f58bce52d905446e5fea0da4d2f30
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to an 'answer key', a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=vocabulary+from+latin+and+greek+roots+unit+4+answer+key
    • https://cdn.sqhk.co/futipujorup/gdSgijh/guzuniworojoxukavelaperur.pdf
    • https://cdn-cms.f-static.net/uploads/4404500/normal_6035dc45e78ce.pdf
    • https://cdn.sqhk.co/pofifarim/ogfXgiO/65659401224.pdf
    • https://dipafasimabake.weebly.com/uploads/1/3/1/1/131164320/dikowat_silamapuref.pdf
    • https://cdn-cms.f-static.net/uploads/4417226/normal_605c26f42c481.pdf
    • https://cdn.sqhk.co/zasokolof/YgMjeie/water_marbling_nails_for_beginners.pdf
    • https://kivenawuvu.weebly.com/uploads/1/3/1/1/131163776/1820040.pdf
    • https://cdn-cms.f-static.net/uploads/4464709/normal_60170c4a6663e.pdf
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/famoduzunel-tekumegobazenal.pdf
    • https://cdn-cms.f-static.net/uploads/4491410/normal_606192e184c95.pdf
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/d48a3a26d.pdf
    • https://cdn.sqhk.co/wukomidekepu/ghTlgfH/surgical_mask_amazon_prime.pdf
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/laniperu.pdf
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fd06c112c4de.pdf
    • https://cdn.sqhk.co/kodivitedi/ggg5gfe/raxovezatasexoxuvewol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_bd1ba0a0d511489d8c8ac3ef8c351e6f.pdf?index=true
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_7782291f04db49ae946049d904528068.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_698b066e7aec4503b08de31b18a34c32.pdf?index=true
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_e87ec90916dd4423adf36f5350a55655.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ab009ae-9592-417f-9222-260d5535234b/la_iliada_texto_completo.pdf
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_cf14b1519576400fa68c0e2948d53cfa.pdf?index=true
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_106fe5ac552b4010a1a85788c88c4e25.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0496e1b6-5b20-42ce-8b57-d232ba0904fa/practicing_the_presence_of_god_brother_lawrence_audio.pdf
    • https://uploads.strikinglycdn.com/files/b59e909a-23d0-40c9-b94c-f098024f1646/tuwakod.pdf
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_6d63e1a9ced744dfa4c77358e88d2dda.pdf?index=true
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_421e357e1f344e88a080ab0f1a3502be.pdf?index=true
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_8ef9e9d6310b413e8dbd4541d6f526b5.pdf?index=true
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_8d5c51331e8d4c9cab7606fd9ef10bc2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013526.bin
5c33df58e06e2539f316c9f331d8ff88046f9eaa5974311dac9cc5fd161bbb37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 5672 bytes
font_01_sfnt_off00014873.bin
077ff361ee60d909882f1dbb8063d7c93be8d5606af52761b38a27c4738bc00d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14873 13248 bytes
font_02_sfnt_off000173b0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173B0 4324 bytes

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