Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b729399e2170215…

MALICIOUS

PDF

88.3 KB Created: 2021-02-25 19:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e92578d5b74fa8d14825f3f73587b04e SHA-1: e3d260a756456adc862c4979aa15336a98c29dfe SHA-256: 0b729399e2170215e3d92cf67d049ac735be312df2a8bca0498ce576ed18540d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a worksheet, aligning with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=bbc+planet+earth+shallow+seas+worksheet+answers PDF link annotation
    • http://zizodoroluxonaf.sportsontheweb.net/66439122763.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/tokisaxororuzopevipojiril.pdfIn PDF document text
    • http://limevekobo.iblogger.org/90602603056.pdfIn PDF document text
    • http://tesepaxe.iblogger.org/limixewusumowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415080/normal_5ff788e61c7d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60200348db3f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388285/normal_5fef6d6e6a991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_602410c6ab610.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/when_did_bc_and_ad_become_bce_and_ce.pdfIn PDF document text
    • http://rajelakitapeki.iblogger.org/sepadezuzot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tefinavi.epizy.com/55326074751.pdfIn PDF document text
    • http://vezifalame.epizy.com/lezudagugefogamaverifi.pdfIn PDF document text
    • http://lozekav.epizy.com/selupanexuvizosazubop.pdfIn PDF document text
    • http://garaben.rf.gd/36007151035.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/51617013202.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/wuzede.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 5104 bytes
SHA-256: 78578b31d7e774e6c4c854355d2273880bf5c18ce5d0c6faf085e40b234d31cf
font_01_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 10756 bytes
SHA-256: b01fa766e8cc0b331ebec6af335b64d50ec084297ed5a2f9dc38387dad74dc5e
font_02_sfnt_off0001306e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
font_03_sfnt_off00014535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14535 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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