Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc1f5d5e1f07eb5…

MALICIOUS

PDF

77.6 KB Created: 2021-04-03 07:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 895c95c35b95bc14f2a4568242dbe8aa SHA-1: 29b64fc882a27da60dfab988b585644ac5d12ff8 SHA-256: 3cc1f5d5e1f07eb54d967db651c748fe276975f75449dc77f56b30bbc479992c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO abuse for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://crophysi.ru/wix?keyword=railway+empire+game+manual PDF link annotation
    • http://daliadiago.com/frasi_di_chiusura_lettera_informale_in_ingleseoymzf.pdfIn PDF document text
    • http://axecheat7.xyz/pivotegikadapaxovogalq4zf.pdfIn PDF document text
    • http://teksalon.xyz/sierra_reloading_bookmgdly.pdfIn PDF document text
    • http://inertbhjbj.ru/tensor_calculus_vs_vector_calculusncrft.pdfIn PDF document text
    • https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/4067690.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/rexusewuloviripunejome7f8ug.pdfIn PDF document text
    • http://shopyou.online/trimble_r1_accessoriesvein4.pdfIn PDF document text
    • https://kuxorife.weebly.com/uploads/1/3/5/3/135313812/fepekekukidewa_lupovusefokewo_fibasubike_vutitowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_5ca7dabec669407c9c2ba4e4ea5ea12e.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_ef49fa45730e47668fad790c73f32709.pdf?index=trueIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_1b79d6f8f7a04d63b0b899c0185333c4.pdf?index=trueIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_7ab9eccce75a4caabdf341d5c6b26cdc.pdf?index=trueIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_521f679d8280413baf42665a9fa747e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/lovilemavuvuzujumosededal.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_3f7ca08e94bb421987f87a8c2d17b609.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/xovat.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_ce96a072605e42c49b011588683cf4c7.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_ac0bc3fbc2e3408fa3cbda8dc744ef2f.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_097eb5e9d7e442d6b3479bd6ebff084f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 4244 bytes
SHA-256: 25cb7211d351a8fe189923c791ed0a9cce75b3ed6ac1493ed35ab40edf682066
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5164 bytes
SHA-256: 23a1507ad181b943a09e5fdca9b31f52a469bf766c63e96c0253d30296c0c387
font_02_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 10652 bytes
SHA-256: d74da10364b094542547a34bfffaf37d027f952d88acc511783d84714cbb536e