Malicious PDF — malware analysis report

Static analysis result for SHA-256 29695fbe588c52e9…

MALICIOUS

PDF

73.6 KB Created: 2021-03-22 20:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7258e68cecdb934526469e4564b8009e SHA-1: d8e1805aa6093ecd875f75d1c9ae225c5420bf2b SHA-256: 29695fbe588c52e9c9c04bb5706acbf3f5b60067d18b84639ef9b35f06c50936
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://jacksth.ru/strik?utm_term=st+edwards+state+park+map', is directly embedded and likely serves as the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests a potential for JavaScript execution or redirection to malicious sites.

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://jacksth.ru/strik?utm_term=st+edwards+state+park+map
    • https://static.s123-cdn-static.com/uploads/4410414/normal_60094df3eb291.pdf
    • https://cdn-cms.f-static.net/uploads/4366993/normal_604e81e46d548.pdf
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fdf238c76ade.pdf
    • https://vonosupaxeme.weebly.com/uploads/1/3/0/7/130740497/770553.pdf
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5fd37a8104443.pdf
    • https://cdn.sqhk.co/rigizisojix/c6mhejg/dikemoderiselevununus.pdf
    • https://cdn-cms.f-static.net/uploads/4409607/normal_60370ece0c69a.pdf
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5fe223d3d5ebc.pdf
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5ffcadb04a7b6.pdf
    • https://rudixesawemes.weebly.com/uploads/1/3/1/1/131163949/603e4611a08.pdf
    • https://cdn-cms.f-static.net/uploads/4451561/normal_6017a9b444123.pdf
    • https://cdn-cms.f-static.net/uploads/4480758/normal_6014612ee027c.pdf
    • https://cdn-cms.f-static.net/uploads/4375700/normal_601e0456b0cea.pdf
    • https://cdn.sqhk.co/gigijuke/RygcR2g/74084023508.pdf
    • https://cdn.sqhk.co/vedanoderifu/TNgdigE/venorefesilajiziwefi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/203563d2-c471-4ea6-9825-7eb22139ced6/covers_of_carry_on_wayward_son.pdf
    • https://uploads.strikinglycdn.com/files/baf4aa0b-7a40-4f87-bc32-40b0bca6cf37/mightier_than_the_sword_meaning_in_urdu.pdf
    • https://uploads.strikinglycdn.com/files/de63b65b-3948-4e80-a46c-2917609872c4/morozobakubotisokopu.pdf
    • https://uploads.strikinglycdn.com/files/80f683fd-0254-44d1-ba58-50632c8f4c67/kenmore_model_665_dishwasher_parts_manual.pdf
    • https://uploads.strikinglycdn.com/files/6e8f0278-a6b8-4ffb-af87-ba7c4a00d8d2/blood_angels_codex_9th_edition_download.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_off0000e2ba.bin
cec259d13baad4f2457f293b03cb174ec2041241128900167fbddb05b598b379
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5332 bytes
font_01_sfnt_off0000f4de.bin
27764c0832a5b027749e58d48741530cc127552bdcc02dbf2ad6429bddd9efbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 10644 bytes