Malicious PDF — malware analysis report

Static analysis result for SHA-256 b034a9813d12ad28…

MALICIOUS

PDF

82.7 KB Created: 2021-05-27 18:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b5a64ec799286ca7fd0477a0329a2bf SHA-1: 512fa6365f8ed29de0daa30c8c84435596abf81d SHA-256: b034a9813d12ad28a2f1397e68e76d500711a23e410383798598262c3036b3b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO spam operation. The primary URL, https://botokaw.ru/strik, is likely the entry point to this network. ClamAV and ML classifiers also identified this file as malicious phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+many+questions+are+on+the+defensive+driving+test
    • https://cdn-cms.f-static.net/uploads/4496586/normal_60419ccfa1b56.pdf
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/sonexoripeb-nemosibavokif-baxumefojeded-rafuxitivam.pdf
    • https://cdn-cms.f-static.net/uploads/4380527/normal_5fe85805a1444.pdf
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/5827879.pdf
    • https://kipofazusaf.weebly.com/uploads/1/3/1/3/131379409/ba294ea0c7cd.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_60503f77a99a4.pdf
    • https://static.s123-cdn-static.com/uploads/4368486/normal_5fce5d902ee47.pdf
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/mowijenazamij-babiweturija-lulatixokeso-dogonub.pdf
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/3934268.pdf
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/valumosawaxopit.pdf
    • https://ximesadi.weebly.com/uploads/1/3/0/9/130969353/edbf1df.pdf
    • https://cdn-cms.f-static.net/uploads/4384831/normal_601d2371aaa9c.pdf
    • https://pazowega.weebly.com/uploads/1/3/2/3/132303248/gosojefupu.pdf
    • https://nanopimage.weebly.com/uploads/1/3/1/3/131398258/4578052.pdf
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/ab70afd8d75.pdf
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/wopuwolowusopa.pdf
    • https://kadutazufe.weebly.com/uploads/1/3/4/6/134639852/fazomatudamivom_pumenejan.pdf
    • https://wigopezejab.weebly.com/uploads/1/3/7/4/137499336/269b1c6ffd0e82e.pdf
    • https://nugibunexediga.weebly.com/uploads/1/3/0/7/130740514/a012a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1f26254b-3d8b-4da7-9699-46346c87159a/walgreens_blood_pressure_machine_accuracy.pdf
    • https://uploads.strikinglycdn.com/files/e2725bed-9960-4425-aa47-de985278178f/how_to_program_autostart_prostart_remote.pdf
    • https://uploads.strikinglycdn.com/files/6ecddb77-54a3-4c78-b63c-e5da5f76dea2/vawujetanoj.pdf
    • https://uploads.strikinglycdn.com/files/544ecba8-b285-4e40-8729-24f5fcbfa0fc/barbie_cizgi_film_izlee_trke.pdf
    • https://uploads.strikinglycdn.com/files/ef7ebb44-b2f5-447b-92f5-02bec8f48c0b/weber_spirit_210_parts_diagram.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010545.bin
5b425d001a10d72b25395b11f05d0e7d09997e11bace7fe024b2f9b4626536b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 5632 bytes
font_01_sfnt_off00011853.bin
b1c9c00e6b93b6c7cd911cd3eafd2e449f3b5d10873cbf3019d1c1a9e58972e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 10928 bytes

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