Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8f456bfa108bc6…

MALICIOUS

PDF

89.5 KB Created: 2021-03-18 03:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a487e37a2e80d7550f2d613e4530bedd SHA-1: e209c5fbddc9cfbaef9b4a1312c3dd9d81d023b3 SHA-256: ed8f456bfa108bc6cad4d137b9069619b07ceabcb6f79bb2eb7b24b59944d450
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically a phishing or trojan payload. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=xicor+power+level
    • https://rodofuzox.weebly.com/uploads/1/3/4/5/134599037/binidiledetax.pdf
    • http://dosaxixapaxa.medianewsonline.com/13322336214.pdf
    • http://rugegav.mywebcommunity.org/zombie_dragon_5e_stats.pdf
    • https://fupakedozoj.weebly.com/uploads/1/3/1/4/131407080/7958811.pdf
    • http://zevibeponakat.getenjoyment.net/24870667202.pdf
    • http://mukinokelek.mygamesonline.org/financial_risk_management_journal.pdf
    • http://bosuxezaxad.mypressonline.com/43625747468.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jiwodiw.myartsonline.com/xugojejepakufozarar.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/lofijunebokoxerezovaxanip.pdf
    • https://s3.amazonaws.com/busutafitufe/miwutipafoguketukipoxenuv.pdf
    • https://s3.amazonaws.com/xonobijikivo/tugewarurigarepenodame.pdf
    • https://s3.amazonaws.com/dusined/91230500515.pdf
    • http://jumepenitujox.atwebpages.com/jejavazazalamivarubus.pdf
    • https://s3.amazonaws.com/dobesogum/guidestar_nonprofit_jobs.pdf
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_58abf71c08e8447cb96273a1920f131c.pdf?index=true
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_9534e2954f5b431ba16ab7a8942991a4.pdf?index=true
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_d7864f660d5d49089093b47d6dd0382c.pdf?index=true
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_cafb2973f4a645e99e8734189522634d.pdf?index=true
    • https://s3.amazonaws.com/lodazojamuva/beneguxewewiwuram.pdf
    • https://s3.amazonaws.com/bajapovogam/what_is_the_message_of_we_wear_the_mask.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011726.bin
89ab0902ce1732441be6b01e24778a3fd697cd7a3b7dc5019b9128578dd0bd62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 3848 bytes
font_01_sfnt_off000124db.bin
1f73af640801635f87285a2c175562a8fe78c08711495cef2f88e907f4a88ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 4668 bytes
font_02_sfnt_off000134e5.bin
5c52a57074dc54796e957083d84d5cdc43d240e7df68ef16fed6dd64ef28dd74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 10556 bytes

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