Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b238cbd83c6604…

MALICIOUS

PDF

90.8 KB Created: 2021-03-01 05:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: be05d3c37e2cbfe7463d7d9c92f9d3f9 SHA-1: b16ead9206962220857747b723d8c72f67a079af SHA-256: 17b238cbd83c6604bb4943d4b727946e0cc65de0fd59c36b0b60ade0640e8984
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://midufefew.ru/123?utm_term=brandsmart+hours+black+friday PDF link annotation
    • https://cdn.sqhk.co/gofelaxes/G3jhjde/steamboat_springs_elevation.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/nojujedexoligasarig.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/terry_pratchett_discworld_series_collection.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fe446819de0c.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/jofotiliwesajivu.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/hFja9dQ/gaberubuvedebiterepaviwov.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/73231322628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_601ca7e727b95.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/jezjfie/71786378656.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/kleinberg_algorithm_design_solutions_manual.pdfIn PDF document text
    • http://nulonelam.66ghz.com/turtle_beach_x42_xbox_one_setup.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunonam.atwebpages.com/73520907392.pdfIn PDF document text
    • http://gavuzolu.epizy.com/how_to_make_calculations_in_excel_sheet.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/nomigobejeporobojomatole.pdfIn PDF document text
    • http://zesodowiponuse.epizy.com/56645284468.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010893.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10893 17260 bytes
SHA-256: 970bdd6b9e6eaa09f537053076d824327409b65cf0bd81483347b9700bd6d699
font_00_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 5616 bytes
SHA-256: 605fafea1d16ca1b74beeb731182c4a19ae2c243ab399447376eb7301cc0017b
font_02_sfnt_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 11180 bytes
SHA-256: ca82f692822a1a35a285010beb60923dd285e9bf22e4a61c780416a0c7eb85a3

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