Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbc0d83486a899c…

MALICIOUS

PDF

70.3 KB Created: 2021-02-22 11:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 07418030aab1a1741f7ed73185f50166 SHA-1: dc9a4de7208322c71ae8a600471c016f60c6b643 SHA-256: ebbc0d83486a899c8f2ad7b99ee90b4d3fa0fb8ddd71971c6ade01fc7f26bb2b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://maypoin.ru/strik?utm_term=mcgraw+hill+wonders+1st+grade+pdf, which is likely used to redirect users to malicious content or phishing pages. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/strik?utm_term=mcgraw+hill+wonders+1st+grade+pdf PDF link annotation
    • https://cdn.sqhk.co/sabumijobude/ieo9mka/baginefugovofurozoloruf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6009ae3d7bc54.pdfIn PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/e28fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5fd66b7b5a742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_6012525869398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_601a45cb9bf01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6020527353909.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/ijgAscB/ninja_revenge_will_rise_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/Djd6heg/icd_10_code_for_infected_urachal_remnant.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/Sjeib1O/nail_places_open_near_me_walk_in.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/aividj1/baliladininu.pdfIn PDF document text
    • https://cdn.sqhk.co/sodovokak/0lhijdS/botepuvapawamonuvojakizek.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/aFjbiiS/16589481004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/dual_antiplatelet_therapy_guidelines_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/pifunajowagigugez.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/suzezanobikimisigaxibug.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/218799172.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_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 5568 bytes
SHA-256: f794d69eca6079cfaada1c4ba2b73dd4036d489a77e138b11167735d33b53f5c
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10800 bytes
SHA-256: b530766ffa4d52f2b811eeca376849af50d0005987b146907726e769d927c523

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