Malicious PDF — malware analysis report

Static analysis result for SHA-256 058ff5121774fba1…

MALICIOUS

PDF

78.2 KB Created: 2021-05-11 08:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1c1fd8aff62820d1a4bc86b0662d0b9c SHA-1: 8002660897d80e015f7e7a02258817cd0386aca3 SHA-256: 058ff5121774fba14898894db9676d958267f8be0ac81f9d433b1a0a5d68af78
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://resalured.ru/strik?utm_term=olympus+om-1n+battery', is particularly suspicious and likely leads to a phishing or malicious site. No scripts were extracted, but the structure indicates a malicious intent to redirect users.

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://resalured.ru/strik?utm_term=olympus+om-1n+battery PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fc7c563b183f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453556/normal_5ff7dc1d1c0d6.pdfIn PDF document text
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/zorijopiwezetof.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/zuvaworabesum.pdfIn PDF document text
    • https://fisokupavunimi.weebly.com/uploads/1/3/4/4/134469682/zajexibisad.pdfIn PDF document text
    • https://medadafamu.weebly.com/uploads/1/3/0/7/130775854/witeto_xogip_jovabos_pofoparoro.pdfIn PDF document text
    • http://vbruti.site/barakotovetnf5ek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501961/normal_5ff52533e4c54.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/answering_machine_greetings_for_business_sampleep6zg.pdfIn PDF document text
    • http://dhl-order.info/68685095579kgms8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5feaf9609d92c.pdfIn PDF document text
    • http://dithetsen.xyz/jawademejisaxetoguh0wwx.pdfIn PDF document text
    • http://prostosite.site/maschine_mikro_mk1_for_saledqw2b.pdfIn PDF document text
    • http://axecheat1.xyz/96682870952dda6c.pdfIn PDF document text
    • http://karaulovlife.site/dell_c1765nfw_fuser9amow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e2dc3c-9283-4bc6-a6c3-f15737525c4e/27838165623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecef86de-d87f-4b68-bfbd-7359a2efa808/xepatu.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_7de8343f927a44df8d29455db43b6246.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_b912dbcffdf4495dbc5b98debd969fe3.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_7f94116ce1dd4f89aed2129e24e6b6cf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 5320 bytes
SHA-256: 18f957e0f7b1ae5528b77c4a1fbd50fc7854956b41c481ffd4afb24b6dc37b7e
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 11200 bytes
SHA-256: 32148a344924f8a8560d3b5ae257e43b312dd65279fcfbd83d241358064f79ee