Malicious PDF — malware analysis report

Static analysis result for SHA-256 3836779027f50be4…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 07:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6333d38023a96c3e76dc979e960d23ae SHA-1: c914f5ba9272ba140e656edb431befacf070b8e2 SHA-256: 3836779027f50be4ebb7a343fbcf7e56c595e972543dabb3841590b1059a37ef
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards an attempt to exploit users through deceptive links.

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://mezovuduw.ru/wix?keyword=farmville+2+tropic+escape+mod+apk PDF link annotation
    • https://mafopovum.weebly.com/uploads/1/3/4/3/134322216/657919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_5fd3afd2380db.pdfIn PDF document text
    • https://bukekumagisalej.weebly.com/uploads/1/3/5/3/135333054/palofozubakexuzati.pdfIn PDF document text
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/vurajivekugepis_tivawepido.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/jihegcJ/39211876691.pdfIn PDF document text
    • https://cdn.sqhk.co/nisikevepoxi/ahaM0hf/find_friends_iphone_ios_14.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/jiGgiHY/golden_boot_winners_2020_premier_league.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_60462abef0f6f.pdfIn PDF document text
    • https://cdn.sqhk.co/taviboku/ihaWgiN/bitoxufose.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/5552cf56-a8a3-4843-b3a5-67f26b265ae1/silenimukewemigewogaf.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_2ec1304c247943619afe5126a10564c8.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_35e591a7f3a44c58a921df56563f723a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/711cb427-9cd8-4301-8d5e-12aa57f4e2cd/how_to_hack_ml_diamonds_without_human_verification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b871736-f6ac-45c8-a9af-6c54e317de65/was_the_proclamation_of_amnesty_and_reconstruction_successful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de96a66a-9389-4830-802c-74142aefe8ea/46286567968.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_065ae6f1e1a24384abf6d1c4e9bc53f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bd5f49-064b-4e11-ba99-cc11ddb1d1f1/what_is_a_flush_in_cribbage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891bc31d-8cb4-415f-a599-04bd746212ae/xabawove.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_f023444e158c405b988b1efc22a3ee87.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_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 5428 bytes
SHA-256: 291811330304a7ecf74a91cab20af54d8241ec13c7ba16a2714d87b9844ce5c7
font_01_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 22224 bytes
SHA-256: 5908a8a82c9559ccc7bcb176a249e043ccfb93586f64bb569bb7e80018d5719f