Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d06fa82dfd50b6c…

MALICIOUS

PDF

80.3 KB Created: 2021-04-09 08:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d756a5fe758045e677ea03ccd9a40efc SHA-1: 6cfa48b2dc6c0a98a82b6a57565d0efddfafe71f SHA-256: 7d06fa82dfd50b6c77f0bdf82470177307a23b17ec066e608026604ca1dc7d9e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable or suspicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of numerous external URLs points to an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=the+island+of+dr.+moreau+%25281996+film%2529+trailer
    • https://ninitirasaru.weebly.com/uploads/1/3/5/3/135317350/9721ca2c382d0.pdf
    • https://cdn.sqhk.co/vetelojid/fU02Ngg/boradanejur.pdf
    • https://cdn.sqhk.co/leporolino/dT8Rea4/fastest_viral_video_on_youtube_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4368496/normal_605f74d0eba30.pdf
    • https://radinake.weebly.com/uploads/1/3/1/8/131856095/vatubunafotax-rufus.pdf
    • https://zevexeduj.weebly.com/uploads/1/3/0/8/130874566/40a3df48ad.pdf
    • https://static.s123-cdn-static.com/uploads/4470409/normal_5ff0db122713a.pdf
    • https://fukuzemuk.weebly.com/uploads/1/3/5/3/135306557/1254496.pdf
    • https://cdn.sqhk.co/zubejavaxuvu/cigjcja/atari_millipede_arcade_game_for_sale.pdf
    • https://cdn-cms.f-static.net/uploads/4502833/normal_6058713f8f0b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_fa395241660e432d91a117b5c2a3de4c.pdf?index=true
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_34f7d90dbd3346bd875552a38d5f9e89.pdf?index=true
    • https://s3.amazonaws.com/dupula/rupisuxedunajofuj.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_797093288ace497c85232303725dcba0.pdf?index=true
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_f8a2b6b64781495799b1babb798bfa96.pdf?index=true
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_fcdd1c7f45394fe4bcec84ebcf4b2423.pdf?index=true
    • https://s3.amazonaws.com/pewebopufupe/xizulod.pdf
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_3944794426c54ff8bbbd6f36a95f94d0.pdf?index=true
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_52e7d8636f20422090568743e502667b.pdf?index=true
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_f3afac23a5eb4ab4837800f197697102.pdf?index=true
    • https://s3.amazonaws.com/bepukuba/81194727498.pdf
    • https://s3.amazonaws.com/fukepez/weather_worksheets_for_first_grade.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb07.bin
83627335c79f45a3076c767f084f49a80d5ab0ed358b0451ddfa45635ba2ff35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 5644 bytes
font_01_sfnt_off00010e1a.bin
19ed7c4da4abe4eb41518766cb6dbecd60e547f57737b51e6ab585cc7941068a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 11032 bytes

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