Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b47782479fc2a6…

MALICIOUS

PDF

79.8 KB Created: 2021-04-27 15:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 451d95f7cf5f18f20d36ba3cae2cd6e9 SHA-1: 43efb01d90297fd1d387a9aae74f62bb0d6e1b13 SHA-256: c8b47782479fc2a673fca3379d36cab8ff16459d0f2dcd85f3edf589adc8d1de
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary malicious URL identified is fokemale.ru, which is likely used to host or redirect to a phishing or scam page.

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://fokemale.ru/strik?utm_term=how+long+prevailing+wage+determination+take+2019 PDF link annotation
    • https://cdn.sqhk.co/xuxiropuwomo/heI2jaa/oxen_free_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/wojinagimepu/350hgif/ecommerce_free_website_templates_for_flowers.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/9346548.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/ijUpsxr/love_apple_farm_menu.pdfIn PDF document text
    • https://nijolonarezop.weebly.com/uploads/1/3/3/9/133999518/vumaje.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/jhfgeKr/98081690786.pdfIn PDF document text
    • https://nobenala.weebly.com/uploads/1/3/4/3/134348336/5095090.pdfIn PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/sogunukupa-zutukovikejex.pdfIn PDF document text
    • https://cdn.sqhk.co/vomemubevu/jdypocw/42573416593.pdfIn PDF document text
    • https://sutafufig.weebly.com/uploads/1/3/4/4/134402916/13b98113b.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/ibhjghi/funny_song_ringtones_free_download_tamil.pdfIn PDF document text
    • https://pitisugokusibim.weebly.com/uploads/1/3/4/4/134445344/jujiros.pdfIn PDF document text
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/8d7e14.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/ijia2t6/online_estate_auctions_columbus_ohio.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/IGggghF/jotidonexenatawamawoxo.pdfIn PDF document text
    • https://wabaxudazisivi.weebly.com/uploads/1/3/3/9/133986682/nupagaxofaworom.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/3b61b44f-3604-4d0d-83c6-36763266dfa0/7675849592.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/89068234015.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/bovakekojuwaxelesa.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/jozojawivut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8446d89-b118-4315-8b48-b5a5821dffa7/what_year_was_the_dell_optiplex_790_made.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/raizes_do_brasil_resumo_homem_cordial.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_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 5760 bytes
SHA-256: 82ee3457937f4f9215eaa0f85c4ce79807b6d809d38b0bf3d973e336396d3865
font_01_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 11128 bytes
SHA-256: fe2d27491e8286f07a37730862b2d07b1700d414561828e2b863fb20137e119f