Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec1158005c9e42d…

MALICIOUS

PDF

73.8 KB Created: 2021-05-17 09:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9c315773c18d42a0cf69d4a0ef7f703 SHA-1: 6226660e5d25b1c3e49f9722334cc03b2fd35076 SHA-256: fec1158005c9e42d7ec501d65cc54504532a8f7432843246194d95e8961786bd
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious content. The document body, though heavily obfuscated, appears to be related to search terms for drivers, suggesting a lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=netgear+n150+wireless+usb+adapter+driver+windows+7
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/gijolebo-mepeso-bajepiguse.pdf
    • https://cdn-cms.f-static.net/uploads/4391611/normal_6011456f19e24.pdf
    • http://paxosij.mygamesonline.org/antonymes_et_synonymes_exercices.pdf
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5fd5f3c48e5fa.pdf
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fe82ac801151.pdf
    • http://xebupado.mypressonline.com/24865512647.pdf
    • https://tasuzifesuxad.weebly.com/uploads/1/3/7/5/137502252/a092e45b8.pdf
    • https://metogixum.weebly.com/uploads/1/3/0/7/130775033/e79688d0be.pdf
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/6170210.pdf
    • https://cdn-cms.f-static.net/uploads/4443814/normal_6043f08cb3825.pdf
    • https://static.s123-cdn-static.com/uploads/4492529/normal_5ff5d435ca254.pdf
    • https://cdn-cms.f-static.net/uploads/4472213/normal_60270b9d5dc8d.pdf
    • https://cdn-cms.f-static.net/uploads/4413242/normal_602cb7a60cd75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_7889a2dbfb5f4b3aba14e8b6cc2ea38c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43c1c811-701b-4e46-8f50-44669666daa5/76441750084.pdf
    • https://uploads.strikinglycdn.com/files/00611103-1750-4a37-be46-1b6d2e87d3dd/towikewowap.pdf
    • https://uploads.strikinglycdn.com/files/dfdf5d2b-aed7-4e00-8964-4d2e6b300243/what_does_3_beeps_mean_on_smoke_detector.pdf
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_da1e962cc6ac4990bfa9914ca60f923c.pdf?index=true
    • 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_off0000e0c3.bin
f0473c5eb35305dff730c571bfee54d463503e93433bd72cf9b3df9f80a268be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 5788 bytes
font_01_sfnt_off0000f4a8.bin
d1bfcea2b03dd284f45cde088f062fd637117eeee1ffc3d1206536ea843194f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10768 bytes

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