Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cf8ebbf8db9849…

MALICIOUS

PDF

81.1 KB Created: 2021-03-19 13:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 021ff26f5dd1fc00303543dc3421226f SHA-1: d614bf59eda078acdb0a414f25973bae923f9cf0 SHA-256: 86cf8ebbf8db9849c0d7e4ea6cbd8ba4851779f12390d252ef8aea7969bad02f
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://fokemale.ru/strik?utm_term=how+to+tie+rope+for+rock+climbing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472760/normal_5fdff8ed7a33c.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/adobe_pro_9_convert_to_excel.pdfIn PDF document text
    • http://dazakefafan.22web.org/honda_50_outboard_service_kit.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/how_to_write_condensed_ground_state_electron_configuration.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_6025f9a065d78.pdfIn PDF document text
    • http://jogajep.medianewsonline.com/clinical_hematology_and_fundamentals_of_hemostasis_free.pdfIn PDF document text
    • http://mutinujevax.22web.org/gumogifugixisajef.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/gQihPeP/rifapogini.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/icRibjc/cooking_master_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_603e902d4fe24.pdfIn PDF document text
    • https://cdn.sqhk.co/dazibewibu/jgyeiai/vunoporelexur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fdd8fa971bec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_fa921355d568417eafaa0451b3fb7f07.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_88fcab6aac184cbc8b4431e5d03daec3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedure/aphasie_transcorticale_motrice.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/abstract_reasoning_exam_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/estructura_de_la_celula_bacteriana.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/jaxozif.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/hermann_hesse_steppenwolf_gutenberg.pdfIn PDF document text
    • http://nojumajemipi.rf.gd/xumozugijutadebadazixinof.pdfIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_255153fd301b4f348a62c9c3c1a53eb2.pdf?index=trueIn 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_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 5204 bytes
SHA-256: b577139262d364bd33970d87819b4ca60ccc0e3002473297c9854d2274843160
font_01_sfnt_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 10332 bytes
SHA-256: f857d0392eab7e8cea5f57dd5dd91e194206bb1c877c47b73327506622ef630e

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