Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e729770ae265a9a…

MALICIOUS

PDF

75.8 KB Created: 2021-05-19 13:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fb03d39afed0a11cbf90162db550d5cc SHA-1: 6d401e540b421013bd27c435d353586fcbad1da8 SHA-256: 8e729770ae265a9a1b377e9c5e0af29cc099a95b21fa57961a6e9812f647d4a4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF documents hosted on disposable domains. The primary URL, 'https://soxebez.ru/strik?utm_term=messenger+pro+mod+apk+download+2020', suggests a lure for downloading software. The heuristic firings indicate this is a link farm designed to host numerous external PDFs, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/strik?utm_term=messenger+pro+mod+apk+download+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498834/normal_6036538a2bfd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529893/normal_5feeeb7a96743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_5fd11d21355eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_600d6c3c6cda7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5ff822584457b.pdfIn PDF document text
    • https://xeziguga.weebly.com/uploads/1/3/5/3/135392729/6136135.pdfIn PDF document text
    • https://desaboros.weebly.com/uploads/1/3/5/4/135400021/4786845.pdfIn PDF document text
    • https://poxunafit.weebly.com/uploads/1/3/5/3/135330231/e86257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_606b584eefd15.pdfIn PDF document text
    • https://wozepunelom.weebly.com/uploads/1/3/5/9/135993859/gimisajanapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_5fdbe1808b4b7.pdfIn PDF document text
    • https://zubefexer.weebly.com/uploads/1/3/1/6/131606337/6502539.pdfIn PDF document text
    • https://nerolokem.weebly.com/uploads/1/3/5/3/135326062/4ea2acae6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c75ec1-20c7-4be8-88ff-78c0eaac8f66/zoxuxozixakogekokela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f46e4a2-dab0-468d-be9a-003d0f61234c/is_ghost_alive_in_power_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0918d26-323a-432e-a073-8453fad87f6f/kolodopawaxuzad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3f4c5b-66d8-4258-92b8-ddcf05914f3e/vofogefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e7840e-27e8-43bb-bbe9-f726eff63139/how_do_i_set_time_on_sony_dream_machine_clock_radio_icf_c218.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 5716 bytes
SHA-256: 8c39a188a9339d5255aa71c615e1e7258f2e81fa0004a0f4f6d3e341caeee3ff
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 10588 bytes
SHA-256: 5cc822e57c9db9ee196edca8289dce0ece1bcc5cf45ffef81a67f62ef18df20f