Malicious PDF — malware analysis report

Static analysis result for SHA-256 8605dc5573a0c923…

MALICIOUS

PDF

89.6 KB Created: 2021-03-19 23:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 52af160abefaf43f47d70e253ca30ac4 SHA-1: ac584a21c7387e7dbece51a49f7d4499b0435051 SHA-256: 8605dc5573a0c9236a2d16583ce6b83dd768a04b8281f49760bc5c823f6ffcb4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be part of this redirection scheme, likely to lead users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=behavioral+neuroscience+7th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485301/normal_603fe485be6bd.pdfIn PDF document text
    • https://cdn.sqhk.co/rinovizifim/gejikgj/live_chickens_for_sale_in_arkansas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_602a57a5a2c44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450415/normal_5feb748151c7f.pdfIn PDF document text
    • https://cdn.sqhk.co/woledowo/gjgfiaU/cowichan_river_fishing_report_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_6023ade280e9a.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/1hijhhO/mosegixibasufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_6031518a2274b.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/hegjcTa/flip_diving_game_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_600790bbd3e43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383146/normal_5fff38454620a.pdfIn PDF document text
    • https://cdn.sqhk.co/kapopuvida/iidTLlA/45327200980.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/tdMijhh/17950515268.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/vxggvjb/posinuwamekotutamiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_60534be9c1809.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_75ea2e53bbc94ba88b9caaaaba42277e.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_e0da970e47004baabc8a1a2ebcabffa5.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_aadde1ea4c714fbfbc7c873e8ca19002.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_3114d4f3dfd843fbb0d784ed44f7f7d6.pdf?index=trueIn PDF document text
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_0efe60bc8bfb42abb4d1bb8f80ef5acd.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_0a7cffd885d440098abec9b5df84a24c.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_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 5432 bytes
SHA-256: 80445f821db848addd6e6decbfd6c598bf69221385a688ed5e54fd77a28fb493
font_01_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 11688 bytes
SHA-256: 065cc19903490d03948bd3fd7bcccb51328730aee5363e8b5d502d17551f9df4