Malicious PDF — malware analysis report

Static analysis result for SHA-256 b841f6e281162faa…

MALICIOUS

PDF

77.5 KB Created: 2021-03-06 04:38:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b0cc4532d4c7f725c2ef5901dea899ec SHA-1: ba0a0eefc083f9a962e6c971bcd327d1a8be1dd0 SHA-256: b841f6e281162faafc74175bb5bccf7bec72b6a78ed4d53582cfa67f86a6cd97
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm intended to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://seumenha.ru/wix?keyword=4runner+service+manual+pdf PDF link annotation
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/kurumezeforira_guwedeponenoluk.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/tojepetezu.pdfIn PDF document text
    • https://vegalatunom.weebly.com/uploads/1/3/0/7/130776393/a747b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473322/normal_603947d319256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_60177570b483a.pdfIn PDF document text
    • https://fofumizuzel.weebly.com/uploads/1/3/2/7/132740209/buxetebudanusajide.pdfIn PDF document text
    • http://betixisu.22web.org/hollister_gilly_hicks_size_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5ffb57c94e63e.pdfIn PDF document text
    • https://bedapidipofawif.weebly.com/uploads/1/3/2/7/132711979/nasonudoba-geniwujoluxuxo-xidoxitelimi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_86823575faa241e28731363467bcd649.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8194ec45-8b44-4071-8618-a96ace565de4/mupegav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a587ff76-48a9-414c-ab21-a29e801bf8f9/55587880269.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_33f2696f54584fac991a03070f6482f9.pdf?index=trueIn PDF document text
    • http://waxodomopupu.epizy.com/65057302768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f0e522-5d78-45e3-a0fb-c32c44652ea4/11327197358.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_13d69f269d344f348216692300c4ed82.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_494f13e14e544354b7648511f454aaef.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_f9d13fae22e94185905d74f296bf17db.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_0204ac649f214071931153eae45f0614.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_9eee10c8ad2e4577a85bf297e7715cc8.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_a2ba476aca344378bdc844c6802a9c54.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_73d1fa1ecac14aa29ee3b9b4f85c348e.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_95846e6927c14852a76a37f845ce2ad5.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_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 5356 bytes
SHA-256: dab7effeec141f1f9fa7e5c34e8812d1c9186916d6fce4828f9f93573112aab5
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 14560 bytes
SHA-256: 95212cbde99e2f098d5e8ad1b6a91e9e19fc7d44a81cb70439c51350ea755412

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