Malicious PDF — malware analysis report

Static analysis result for SHA-256 56531965a6d68215…

MALICIOUS

PDF

74.2 KB Created: 2021-04-29 14:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8f09a7847e675c5c00c0a2ba4571f4b3 SHA-1: d2772ce76d7b7c819db3a860fb7b7ba7c84728ef SHA-256: 56531965a6d682153e8624d47db1d6af418ad23f55d1349e082f331c9d42052b
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL `https://xezojetit.ru/strik?utm_term=round+table+discussion+ideas` is the primary indicator of malicious intent, likely leading to a phishing or malware download site. No scripts were extracted, but the PDF structure and URL suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://xezojetit.ru/strik?utm_term=round+table+discussion+ideas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369496/normal_60027c8b07e7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450638/normal_5fdaf5a6462de.pdfIn PDF document text
    • http://vupaniseb.iblogger.org/bekogoso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462976/normal_5fd055964c029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5ff3b255a4fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_603dc3cd29ab9.pdfIn PDF document text
    • http://the-glow.ru/wepogurexodasenidipejukoycjpn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_60614cb6954d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_601050fd9f50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454277/normal_5fd9c18b4a58b.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/jufopelaturije.pdfIn PDF document text
    • http://topcreditreport.info/76560317967mvnf2.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/evenflo_maestro_sport_booster_seat.pdfIn PDF document text
    • http://groby-ritual.online/85590256876bt4dw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_602d044e632a2.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/surasulijozolen.pdfIn PDF document text
    • http://xewodatesuporob.mypressonline.com/26028224267.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/af2e0e60-0581-422c-a445-31828ac02b34/dafefemirigilozutigawu.pdfIn PDF document text
    • http://xunepaja.rf.gd/annex_19_icao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafd3602-0cf2-4afd-99fc-b9532c9e7dec/39728856810.pdfIn PDF document text
    • http://bupojawepuda.epizy.com/thyroid_function_tests.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/47774855158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2d475d-46ad-4fb9-91d7-c42621a94af5/69297659378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1705d269-adb4-4860-b9ed-9d2d0299f35f/how_to_reset_thinkpad_t430.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_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 4984 bytes
SHA-256: 17174a87aae15262d453c07bf27896ab3dfde35e678db74c67a591e608bb338e
font_01_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 10332 bytes
SHA-256: 5422030ffb0ff96041b05cd6451deba84dedb9eea2a82d21d3ffd811a999d3a2

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