Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d7a32bd7358b3b…

MALICIOUS

PDF

80.3 KB Created: 2021-04-22 07:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f4941aea39a3724837f130b648a7da7 SHA-1: b0aa23938c899db02ce0791cd9936225dab91256 SHA-256: 76d7a32bd7358b3b1d303f782dbb8cc0b9c148dd37aa198dd3855e87d976e12e
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 phishing or malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to redirect users to potentially harmful sites. The embedded URLs and the heuristic firings strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://nipisod.ru/strik?utm_term=john+deere+48+snow+plow+parts
    • http://about-central.com/lonely_planet_ebook_usas_best_trips60ha9.pdf
    • http://razvivatel.blog/56133989847z4075.pdf
    • https://suwanofanezelon.weebly.com/uploads/1/3/1/6/131636577/8119203.pdf
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/nubibe-pexilerova-lukebafe.pdf
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/2806947.pdf
    • http://vujenixuwo.mypressonline.com/fupiwenumivu.pdf
    • http://sozawakofuriwoj.getenjoyment.net/nugawe.pdf
    • http://kutegexuwudaro.getenjoyment.net/which_engineering_has_highest_salary_in_kenya.pdf
    • http://milanbeachs.space/ribexuqmwrr.pdf
    • http://kidiwutimako.mygamesonline.org/subadix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_8778b2cb2410496782cd5132b7e2c64f.pdf?index=true
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_f80d47cfc00a409795cc76427e15c139.pdf?index=true
    • http://fadudenomo.onlinewebshop.net/girl_scout_chants_and_cheers.pdf
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_ef26cda68695467c83bc437b2f4bfac4.pdf?index=true
    • http://bozagasixafovo.atwebpages.com/prayer_that_availeth_much.pdf
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_6281fef7747148ff8237e191ad513fe1.pdf?index=true
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_646b899656db48a6a4a52a256ac79667.pdf?index=true
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_056fcd465c6a493994cdc22b77db6a5e.pdf?index=true
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_499845e1374046599b9ea61fc2498512.pdf?index=true
    • http://pekafujojef.onlinewebshop.net/borrow_money_agreement.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_off0000fbd8.bin
57f4e1ed60277d16bf0703bd840edc6ab9151d2ad4323925a167d60dddcee68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 5412 bytes
font_01_sfnt_off00010e4c.bin
e4e1f67781a1ed3f9580f96a4db6277af0f820bde8af36281cd00e7f2537cc99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 11104 bytes

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