Malicious PDF — malware analysis report

Static analysis result for SHA-256 7444aa4088924551…

MALICIOUS

PDF

77.1 KB Created: 2021-04-21 10:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 657323cb88ff86a2bddd81b465c23078 SHA-1: 574de191cdf0ad3f470dc2aab59c254b12d51a29 SHA-256: 7444aa40889245517700c74733d5c802efb8baa08e482062cb8b3b0f41029750
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary external URI points to a URL that appears to be related to a scam or phishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=stihl+trimmer+gas+vs+battery
    • https://cdn.sqhk.co/guzoladip/difgchg/art_arctic_fox_wallpaper.pdf
    • https://vudasanuvopiw.weebly.com/uploads/1/3/4/7/134737570/vopor_sewifuwovobazem_lanujukuziwop.pdf
    • https://cdn.sqhk.co/dokijesu/9PidigY/avg_pro_full_crack_apk.pdf
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/jobosoxutumipuvirus.pdf
    • http://nesakud.mypressonline.com/66637562055.pdf
    • http://wasegulom.mygamesonline.org/14432882584.pdf
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/fonajigida.pdf
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/efe54b9f49173.pdf
    • http://fovikoxesaweziz.medianewsonline.com/36251665646.pdf
    • http://nupewijanetari.medianewsonline.com/magic_bullet_walmart_canada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/543d87b2-9870-44ab-8e52-517445e50cf7/fefotiwobis.pdf
    • https://s3.amazonaws.com/sinadi/98029150548.pdf
    • https://uploads.strikinglycdn.com/files/325a150e-e304-4762-a60e-563395b2f3b3/rabumidewos.pdf
    • https://uploads.strikinglycdn.com/files/e4486f09-87e2-4113-950b-a47192ef0ecd/13421837641.pdf
    • https://uploads.strikinglycdn.com/files/17637bbe-7302-44e8-befc-00c03ab013d3/wobikubomusaboledopavuda.pdf
    • https://s3.amazonaws.com/boxalewijim/vogojapogewo.pdf
    • https://uploads.strikinglycdn.com/files/14481403-1b0c-49f2-9f92-824d3471a6b8/what_does_a_supermarket_plastic_bag_weigh.pdf
    • https://s3.amazonaws.com/fajujiju/photoshop_for_dummies_video.pdf
    • https://uploads.strikinglycdn.com/files/a2b8eb50-c603-4267-9ce2-79283ac24b2c/what_are_3_reasons_the_renaissance_began_in_italy.pdf
    • https://uploads.strikinglycdn.com/files/dc82929d-4ee2-44f9-bbb2-165cdc4734ec/rirepegunenipojofogo.pdf
    • https://s3.amazonaws.com/zubuwujoxom/city_of_omaha_planning_department.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f056.bin
1c998337f08b06e33973b3f8080e6c6fe6e4714b0ddfa3045e82ba96d966fa88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 5504 bytes
font_01_sfnt_off000102e9.bin
201e149340bb76efdffe55c643e570f3d7a276282402d5717eca25c0f2bf92eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 10536 bytes

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