Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce32f04cdab648f5…

MALICIOUS

PDF

64.7 KB Created: 2021-03-14 20:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 11e5d0b05ce5b354441b7c739ef3960c SHA-1: 084baaa36bc5b83b1c27136534f087021dda935c SHA-256: ce32f04cdab648f5717d026cd6a433faa8258206656f42fe70a895d7aa62f734
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm structure suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://jacksth.ru/123?utm_term=argos+treadmills+manual PDF link annotation
    • http://anarchymedya.com/27568132994yc1vr.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/82AjaRU/mififomore.pdfIn PDF document text
    • http://nanolenka.xyz/guvedijamukaleruluta206ap.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/gjibvgd/23747295647.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/f8Qgiig/civil_war_battles_nashville_tennessee.pdfIn PDF document text
    • http://kawlites.online/toefl_exam_pattern_and_syllabus2u2ri.pdfIn PDF document text
    • http://japancar-sib.ru/84681108152ifrhf.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/ehahghj/95710834772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_5ab6639de4194ca292a3f98f33cca25e.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_6c43da8c25df4937ae7a8123924718fc.pdf?index=trueIn PDF document text
    • http://pizisufomabal.rf.gd/84068100106.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_dc15e7cccd1d4657be9bd9cdd25de411.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_528dfd558a8847a68e68f4e2a4b52da8.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_cfdf26cfc7034a2daf09ffb3855cc191.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_79ea9fd1c465454c8ec46b5e7e578ec7.pdf?index=trueIn PDF document text
    • http://rabazefobozaxa.epizy.com/84343259958.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_6d564f09f2514539b3572814accd2bf2.pdf?index=trueIn PDF document text
    • http://mofapaxuwalix.rf.gd/iceland_map.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_off0000c15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15B 5132 bytes
SHA-256: 3b2f2be92d681dff6aa4c4d37eed2d103d721c3191e430ac924848259cc318f6
font_01_sfnt_off0000d2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 10296 bytes
SHA-256: d54c997f1bbdf654c1b663761f332653fa28490c78d9324e361df6902eafe492

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