Malicious PDF — malware analysis report

Static analysis result for SHA-256 761c0909ed6331c4…

MALICIOUS

PDF

80.9 KB Created: 2021-05-11 21:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 639e2b4852715750fdafa26392217420 SHA-1: e7574b1ac4ca8ee7611e6e4fdc71ab7fad18b0c6 SHA-256: 761c0909ed6331c41ce5ead14b22b28a05c2b4191f61e3d8096d5b8653dbf046
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=common+guitar+chord+progressions+pdf
    • https://kajumosezu.weebly.com/uploads/1/3/4/7/134749214/1b33e7f.pdf
    • https://cdn-cms.f-static.net/uploads/4390051/normal_6034e39422223.pdf
    • https://cdn-cms.f-static.net/uploads/4381766/normal_6021856ce3766.pdf
    • http://ramosojakapo.iblogger.org/e_commerce_books_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fd319a78672c.pdf
    • https://siwufofewexiv.weebly.com/uploads/1/3/5/3/135329456/sevazapurazote.pdf
    • https://cdn-cms.f-static.net/uploads/4365553/normal_6040bcaf6624a.pdf
    • https://cdn-cms.f-static.net/uploads/4488817/normal_6058f966dc44b.pdf
    • https://gozibaduvixumu.weebly.com/uploads/1/3/4/6/134628844/3297945.pdf
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5fd26981b0f7b.pdf
    • https://cdn-cms.f-static.net/uploads/4374700/normal_6025b66d30737.pdf
    • https://cdn-cms.f-static.net/uploads/4422168/normal_606d02d16f5ec.pdf
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/bedoden.pdf
    • https://suxamoka.weebly.com/uploads/1/3/4/8/134876373/0a2dbdc5c0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/memexelu/48182710815.pdf
    • http://fodiragotisaka.epizy.com/noberamibasibenaxekigaja.pdf
    • http://zusobudem.epizy.com/birth_rate_definition.pdf
    • http://sekijipaladi.epizy.com/50484343349.pdf
    • http://famuruvif.epizy.com/gomatuxuj.pdf
    • https://s3.amazonaws.com/kulinisokakewi/performance_appraisal_examples_for_hospitality_industry.pdf
    • https://s3.amazonaws.com/tifuwuw/m._a_history_date_sheet_2019_kuk.pdf
    • http://rogofijanititad.epizy.com/witiponetozakul.pdf
    • https://s3.amazonaws.com/mawesenasijoser/orange_movie_audio_songs_telugu.pdf
    • https://s3.amazonaws.com/fifomi/ruzogexil.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_off0001000f.bin
8e51c82af3376e1d4113beba1c55ddad3b6f4855b11186298af379b1bf281952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 5440 bytes
font_01_sfnt_off00011267.bin
30d22779fa66586e36f6b8288ad7bdedb58300ea45c7439d0325ddea33ecef98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 10392 bytes

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