Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3cbc34938e34f4…

MALICIOUS

PDF

72.2 KB Created: 2021-05-27 18:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 675164530e8ecf8f5d1be1e168f614a9 SHA-1: d02936945d005ee58d18cdc1703d8a86cfcbbee3 SHA-256: da3cbc34938e34f44d6b66139fca9abb3010de04d3a1f28b15a5ec96c745f5c3
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The primary link, disguised as a search result, points to a suspicious URL. ClamAV and ML classifiers also indicate malicious content, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7004

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
  • 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
  • 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://scripts.sil.org/OFL

Extracted artifacts 1

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

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