Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad02d3b5e3a0d385…

MALICIOUS

PDF

76.6 KB Created: 2021-03-24 12:35:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ebe9119ab2caddcc7f9a15f368c8ba6c SHA-1: ebb1b00ac22c97f3a2320a07e75159f358a21330 SHA-256: ad02d3b5e3a0d38548b970b2a80bd224b87bb8fee2816732b9cdf8e7f668425e
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 0.9998

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://druttle.ru/123?utm_term=adobe+flash+player+for+android+firefox PDF link annotation
    • http://cparta.moscow/defedivuvx1e.pdfIn PDF document text
    • https://dujajiworexu.weebly.com/uploads/1/3/4/8/134848881/283037451ba.pdfIn PDF document text
    • https://pajodiwid.weebly.com/uploads/1/3/0/9/130968992/pujokamo_roputajakow_desuvenenupata.pdfIn PDF document text
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/mijekasine.pdfIn PDF document text
    • http://airbin.top/pubg_uc_hack_gx_tool_apk294wn.pdfIn PDF document text
    • http://topplafond.xyz/18953486937m9aej.pdfIn PDF document text
    • http://carluxepaint.site/expressions_with_get_worksheetyrpsj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://besevinoferoza.epizy.com/mizesejupexoluxusumiseda.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_8d93d005806b43828251894b19ba5459.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_58f0b50993714907b0789074a45b2834.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_c85ff2a8cb3f41809b994f619b70db3a.pdf?index=trueIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_1818714a24234ff8892ee91d2ca2faba.pdf?index=trueIn PDF document text
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_d93ec283d37f41d2b20f8287c597b7da.pdf?index=trueIn PDF document text
    • http://goseletew.epizy.com/aix_basic_commands.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_7a2051f603884531b74309f95c7d4d3a.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_d956a9bae9744fd4bca877c8e87e2b5a.pdf?index=trueIn PDF document text
    • http://nasedelowose.rf.gd/ghatak_bengali_movie_song_free.pdfIn PDF document text
    • http://tonefira.epizy.com/sekujanomukaxadis.pdfIn 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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 5428 bytes
SHA-256: 2c968d88992d59ce78646093ee9ac6ca4dad2c7e0cf565b688db0a3eb924fe15
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 10800 bytes
SHA-256: 5dbbd3af8cce0bc6a31c896d52195b8ba3d32cfc2df1c2dd0e18f1cd06f42432

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