Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bf3f64cd9ca5c5…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 14:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 27c16e1f3877e908fd738f76efc4c5cc SHA-1: 9094072d05b3abb70dc98f92e9258d3ca545f201 SHA-256: f0bf3f64cd9ca5c5d86ff2827b7352ef2b513ad03a05dc6df2dd205c7a8e0e1f
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO spam operation. The primary URL points to a resource related to 'exercicios de associa\[%C3\]%25A7%25C3%25A3o de resistores em pdf', which is likely a lure to attract unsuspecting users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/award?keyword=exercicios+de+associa%25C3%25A7%25C3%25A3o+de+resistores+em+pdf PDF link annotation
    • https://jizawabule.weebly.com/uploads/1/3/5/9/135966138/1318920.pdfIn PDF document text
    • http://hightrade.club/why_isnt_my_space_heater_workingnqzgi.pdfIn PDF document text
    • https://pinejose.weebly.com/uploads/1/3/4/4/134467182/6541937.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/australian_english_pronunciation.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/55c6c05d62781.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/dolitezoto-fivobuwaz-gabuzobeno.pdfIn PDF document text
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/kigogerafog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_604e6386b708a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_605193406858a.pdfIn PDF document text
    • http://tevfikyuce.xyz/auld_lang_syne_piano_sheet_easy3l6av.pdfIn PDF document text
    • http://betmoy54.com/ameritron_al-811h_user_manualwadgh.pdfIn PDF document text
    • https://kakadolaronenun.weebly.com/uploads/1/3/3/9/133997154/tabasufalufap-gisafagiluz-poraminupa.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/xazox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_60178e8d56cc1.pdfIn PDF document text
    • https://memebewaliz.weebly.com/uploads/1/3/0/7/130775997/390232.pdfIn PDF document text
    • http://mikrotikwizard.com/westminster_chime_wall_clocks_for_salefp7a2.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/tofabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfd0e16-6f1f-4196-b349-94ef6210a61d/best_free_daily_journal_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8dc2475-910c-48a2-8ce8-d43c93c0a396/51638060316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404a8967-8245-409b-b2a6-df9bdff06154/kozubebabutobovegiwix.pdfIn PDF document text
    • http://pupagerirawax.myartsonline.com/oxford_picture_dictionary_english_chinese_download.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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 5792 bytes
SHA-256: 01948c154066841e72b280eb33a5547eb3f0d8788864a79663c4640ce0c271a1
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 12880 bytes
SHA-256: 3ae8501963f3482d308e7043e325655036476228ca712670831a188f8e544d78