Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf9edf6552f5bfa…

MALICIOUS

PDF

91.9 KB Created: 2021-03-20 12:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8ba1c933f0845a9025f1a68524b35b1c SHA-1: b4c4f3d0b6b92759633af69dd7f56db1a68edae4 SHA-256: 0cf9edf6552f5bfaea3fb1e6a304e2eea68f5e777d5e6ac6b565b2b3ed1ab9c2
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of external URLs and the nature of the heuristics point towards a phishing or malware distribution attempt disguised as a document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=the+chocolate+war+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419452/normal_601aa21ff156a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5fd09027b46c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fce610aa682f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391909/normal_5ffb32ac89621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_60185104118fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5fde370238304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_601df9bf17ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_600f47206e5d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fd92daf12a1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gesumorazawetum.rf.gd/zufilabuxalinolakor.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_9c9f430c0a5e4f68908335767ec70cca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf56b05-98db-4ccc-91cb-97c4c3839b1a/unity_editor_download_size.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_8824395f8bff42ee86a17d5a0355e85f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd43108-6e63-407c-9355-b55d73b3da7e/kedinafopesebu.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_fd4f8050c3d548c9bcceea7448639ff6.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_bb718400bd3c4daa854372ab587f0574.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90052dd4-9c35-4ffb-8887-a2b7883b81c9/16410671512.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_85af43aab41846ab85bbc9d67e407c2f.pdf?index=trueIn PDF document text
    • http://vorasatijede.rf.gd/50306561655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3d98ee-53e2-4669-8679-6b700d766b37/white_rodgers_programmable_thermostat_1f78-151_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d036df8-ce4a-4f05-a363-e846a55eaa43/fokodad.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_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 5104 bytes
SHA-256: 989afcf5f4bc3978acf05fb26879a4e5c35b79f812dbababc0e4e876b89576d5
font_01_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 11532 bytes
SHA-256: a4b64047be23ce4f5a8e9a516eb59c5afe5410505e6d7217d61c8be1d8d17eb1

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