Malicious PDF — malware analysis report

Static analysis result for SHA-256 6108ec0e92ad4a11…

MALICIOUS

PDF

77.6 KB Created: 2020-11-25 18:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a56c7a601d68870c6ebd26d2b8db0f36 SHA-1: d1fbd6eb6b7d20d4d7430c2ef5e8f04e321b7f88 SHA-256: 6108ec0e92ad4a11ed993744480ecacaecbc9d8f9b33912e60cab7ceeb672319
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, containing numerous external links, many of which are PDFs. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/strik?utm_term=town+hall+9+attack+strategy+2019
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/vugeleti.pdf
    • https://bokixewabukogu.weebly.com/uploads/1/3/4/3/134341992/9618629.pdf
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f8b7161e6c79.pdf
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/rajakefojazol.pdf
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5f94a2e1c1857.pdf
    • https://cdn-cms.f-static.net/uploads/4381102/normal_5f94e56cd86e8.pdf
    • https://cdn-cms.f-static.net/uploads/4404512/normal_5f9e3a1320957.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/votuweroxigezog/texas_house_lease_agreement_form.pdf
    • https://s3.amazonaws.com/wazotojemov/guy_wires_meaning.pdf
    • https://s3.amazonaws.com/bevekizadoxuj/pebewu.pdf
    • https://uploads.strikinglycdn.com/files/38f047ef-8667-4b12-b610-adc48b4a4fb2/64212445835.pdf
    • https://s3.amazonaws.com/remuv/48665997064.pdf
    • https://s3.amazonaws.com/nuruvapozixix/19152832605.pdf
    • https://s3.amazonaws.com/wavunot/potarusufuxoru.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d830.bin
2102df5ef80fbf85ef73f044d7a14cfab4479e503db15399bdb5d6e118203df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 5752 bytes
font_01_sfnt_off0000ebdc.bin
c7f2359d6ae464cede0c00f8bcdb05e8c430d5a94b00e990ad8a7bc55f65c1b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 11392 bytes
font_02_sfnt_off00011286.bin
9484d3dcd6b4f12702b9ef1b36de2123c93843e4da1bfa490c628bef9c69c370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 16564 bytes

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