Malicious PDF — malware analysis report

Static analysis result for SHA-256 942b0b422ff59bd4…

MALICIOUS

PDF

67.0 KB Created: 2021-03-10 13:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f6268df3e2914977d79229b70e45868 SHA-1: 9c0572dca14d9f43e346f3c5fc5b5ddbe2f8c357 SHA-256: 942b0b422ff59bd49ff10bb969a46c412d505cea0f81da15e3e2b1f9b08311e2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/award?keyword=operatoria+dental+barrancos+pdf+descargar+gratis PDF link annotation
    • https://sujezebaxoxil.weebly.com/uploads/1/3/4/3/134316131/4f1f01a11e.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/8709878.pdfIn PDF document text
    • http://mizeveba.22web.org/agnisakshi_song_audio.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/load_cell_wiring_guide.pdfIn PDF document text
    • http://fezopurabozel.iblogger.org/zalaguveletoniverebomivi.pdfIn PDF document text
    • https://babixapimobikig.weebly.com/uploads/1/3/4/8/134873785/7b211cc5a0fa99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/durereri.pdfIn PDF document text
    • http://medemamonolusav.rf.gd/77601315898.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_411184b9d98643008e1c82c67b907294.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_197ec1b4bcfc4bbf8e26e3a44b12a537.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/38533747444.pdfIn PDF document text
    • http://jesuwipefeg.rf.gd/67909410888.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_d847088b91194c8f8c228a96fabbf221.pdf?index=trueIn PDF document text
    • http://kadabebakolavaw.rf.gd/gamulowiluduxusitel.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_7a8e3ed6f68b4920bfdb6e7e8218bb85.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_49107fb140814940bc2750c7f2e2e092.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_1c710aced4904852901bcfe27fca741c.pdf?index=trueIn PDF document text
    • http://bixogonabu.epizy.com/monirovilepej.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_70a0c694eac344e2965e2f6d7d47040f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/wiziti.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_b1b57ce4b8a04f31b9aa45cb1cfa1109.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somamere/66966868515.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_618f8d4567f149d482d993b454d26cc9.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_off0000caf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 5492 bytes
SHA-256: e21f9841bc8fd6ee98879c60bd817f43df4a29cb907e39eca1b063a04d8917fe
font_01_sfnt_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 9620 bytes
SHA-256: 841ff8de71c85976bdf7f535b39f1c8baf5d856f37e4b78316c1809d64168a52

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