Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4911f0398fa311…

MALICIOUS

PDF

81.6 KB Created: 2021-05-30 00:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91f16738880c76a03dd1147e2a83972a SHA-1: 7dab1cbd2bf61930cea72bf67db78c91273e5b1d SHA-256: 2c4911f0398fa311acda5aa3cefaf374667512603828810fd0121b79203e3359
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL suggesting a download of an APK file. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the detected heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=descargar+chameleon+run+apk+uptodown
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/e10b9306b.pdf
    • https://vosefeluvem.weebly.com/uploads/1/3/5/3/135382784/6392303.pdf
    • https://lexifodupep.weebly.com/uploads/1/3/2/7/132712330/duzesosuvav_lafazezibivaki_xituzi_xodefimodi.pdf
    • https://cdn-cms.f-static.net/uploads/4367632/normal_6057038bb278f.pdf
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5fe8450ff3f3b.pdf
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/5992129.pdf
    • https://cdn-cms.f-static.net/uploads/4377101/normal_6036db1c914ad.pdf
    • https://cdn-cms.f-static.net/uploads/4392868/normal_601da583317fa.pdf
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/botarigol_nepipevadufa_kixuvawoponopa.pdf
    • https://wemogejivaje.weebly.com/uploads/1/3/1/0/131070934/bujafisur.pdf
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/cc612a67a3c9130.pdf
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5fe63f2f672d8.pdf
    • https://jejomedilad.weebly.com/uploads/1/3/5/3/135316302/ruzinitug.pdf
    • https://duvugatezema.weebly.com/uploads/1/3/4/6/134650783/6083026.pdf
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fcb2883353fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/87f3d382-c90e-4916-8840-40b45f8d12c2/30771895904.pdf
    • https://uploads.strikinglycdn.com/files/6e50332e-e463-4bda-b365-842cf51f01ca/pokmon_alpha_sapphire_guide_book.pdf
    • https://uploads.strikinglycdn.com/files/ee5e6fe9-afe9-4cec-96fb-62f38ac33671/zubitivonuzim.pdf
    • https://uploads.strikinglycdn.com/files/33b4d51c-570c-4fb0-b226-fc158e1ad4d3/thinking_like_an_engineer_ica_answers.pdf
    • https://uploads.strikinglycdn.com/files/f5629bd3-4925-4d51-ba99-af2b07fa6bb6/vurumovitivarejumimuv.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_off0000fcaa.bin
1f9e27f22c5579a66be08cdc9685430a4d50e05efcaa14729e49f16cfb033f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 5644 bytes
font_01_sfnt_off00010fc9.bin
1e2faf275a3727e544bf6872d11696550430aa82b1ac251fbc2d2371ec466a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 12376 bytes

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