Malicious PDF — malware analysis report

Static analysis result for SHA-256 a879e23076e21c74…

MALICIOUS

PDF

80.3 KB Created: 2021-02-18 21:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ef374c26e1b97336360fc5920995bcc8 SHA-1: 5a10bde34e77ef5aa682aae86311968f55c77687 SHA-256: a879e23076e21c7428be57879618aa444212592b3a1d92c65bb644125f55b961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, characteristic of a link farm, with the primary observed URL being 'https://jacksth.ru/strik?utm_term=garmin+650xi+simulator'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, with 'http://kelirajisob.66ghz.com/tottenham_hotspur_kit_size_guide.pdf' being the first identified. The document body is heavily obfuscated and likely contains further malicious content or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=garmin+650xi+simulator PDF link annotation
    • http://kelirajisob.66ghz.com/tottenham_hotspur_kit_size_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5fe3eb6b4380c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479460/normal_600903a46ea4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_60127964ebbc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455673/normal_6007d4817b594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448545/normal_602225e7e2abd.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/gumisobetumizije.pdfIn PDF document text
    • http://ketosimple.online/nexutufuvcb2ui.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5ffb1fceb8cc8.pdfIn PDF document text
    • http://copyrightnotices-form.com/gravity_bong_stemmbu9t.pdfIn PDF document text
    • http://detonic-hypertonie.website/79394895827hz7v6.pdfIn PDF document text
    • https://mifimixaxenerut.weebly.com/uploads/1/3/3/9/133999571/wexiwu-ludunenopefuz-kabarer-vanirufikak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491433/normal_5ffb372591803.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/7635a5.pdfIn PDF document text
    • http://hr-insider.com/mini_snake_plant_singaporekh7b7.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/73ed3f2.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 1872 bytes
SHA-256: 223568fc15723d408f00056d2cf6bf73ec0b5e81a44ab038b8d55cfaeb1c3c3d
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 5348 bytes
SHA-256: 7211ff0ac3b1c5e60acd00fca24821166c130ca265f51761a75571112a4ec3e8
font_02_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 11140 bytes
SHA-256: 11b58d02a882a5c47690ed1109cddfe9ac199910680b597ef35cfc57f06ed4ba
font_03_sfnt_off00011e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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