Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7ee974d3b59963…

MALICIOUS

PDF

84.0 KB Created: 2021-03-16 01:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 451a1297a52000f69d13fdb87021f79f SHA-1: 9c546a472f4f7fbeced92ad826c3943fe1703cf5 SHA-256: 4d7ee974d3b5996328aa1ab9b4ccac54db292c69d795e8ba8f116091b96c9c8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://midufefew.ru/strik?utm_term=schlage+deadbolt+key+spins PDF link annotation
    • https://cdn.sqhk.co/modonasuje/hbRngh5/vifijupozejopakewodo.pdfIn PDF document text
    • http://jakivuxevova.22web.org/how_many_words_do_we_use_today_that_shakespeare_invented.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/4541804.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/ruwuwebubox.pdfIn PDF document text
    • https://cdn.sqhk.co/fagijopi/hagiUjf/39515359887.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/e558d908eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_5fe38b52ac25d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_5fe6a42756e8e.pdfIn PDF document text
    • https://rijesire.weebly.com/uploads/1/3/0/8/130814070/xivonagek_rijarob_jovukopedekewa_batifureliveme.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/LhhjdTC/721299535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408582/normal_5ff42ce13ae78.pdfIn PDF document text
    • https://nimidakotogala.weebly.com/uploads/1/3/0/8/130874585/ginewafezukefuw.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/jXjaPib/fomojiz.pdfIn PDF document text
    • https://golinogejus.weebly.com/uploads/1/3/1/6/131606227/sawizatotinitu_mugojamimadi.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/7565889.pdfIn PDF document text
    • https://kodidenub.weebly.com/uploads/1/3/4/3/134328035/texozebebejovipug.pdfIn PDF document text
    • https://vewosofi.weebly.com/uploads/1/3/4/4/134493368/xozekatabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumejivoreka.rf.gd/rinnai_gas_flued_heater_parts.pdfIn PDF document text
    • http://kagumabexa.rf.gd/22091414808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb452fb-33f8-4f16-ac60-80fe952083e4/sample_essay_for_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a0febc-43a5-4650-9dfd-a272e3cf777d/englander_pellet_stove_factory_settings.pdfIn PDF document text
    • http://famirasavu.epizy.com/do_not_despair_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e12637-8d1c-448a-9e10-e16baf553ec5/woods_outdoor_timer_instructions_50126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a831696b-a680-4fec-bf7c-816d006ebeb0/43703319171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bbd55d-ec5c-44bf-82e4-bf5bae287d7a/pilawedujejoxisurup.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_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 5648 bytes
SHA-256: f2d90aec50d0e9479cce7b725549ee42dad63a3cbe3e5c50c844ca94e9e53008
font_01_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 11228 bytes
SHA-256: cbee766e5ea754e5eab95758527a7dd47a11518cee2e918afbaf3ff0649fcd38