Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0254d85619f0ee…

MALICIOUS

PDF

85.3 KB Created: 2021-02-21 21:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1610271af30d54cb99449fdc6a216011 SHA-1: 10c33bf5948208dd0b5f9bdb183bacd4cdcf00d6 SHA-256: 0a0254d85619f0eefc3d8da734e05c7d6f551a22cd928d8d2e92f92cd9ab8613
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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 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.
  • 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://baarspo.ru/wix?keyword=musically+apk+android PDF link annotation
    • http://help-bluebadgecenter.com/risd_school_calendar_2019-2033xkq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_601459d4742cc.pdfIn PDF document text
    • http://usecabinets.xyz/help_a_reporter_out_loginpyi1r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_5fd97798989c9.pdfIn PDF document text
    • http://ighelperscenter.com/pf_non_employment_certificatel9isz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5fcf5b30017ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5fd8a1add69ba.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/ninabobagor.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/6c00db3a.pdfIn PDF document text
    • http://milky-rp.space/appdynamics_tutorial_for_performance_testingb0efb.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/wufezufududotujo.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/defavedunufawavati.pdfIn PDF document text
    • http://paktum.pro/88748726340zhgzh.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/widetunipet/bhadra_audio_songs_ing_telugu_lo.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/80910486394.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/62360151880.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/brambly_hedge_winter_story.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00011854.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11854 27120 bytes
SHA-256: 976d2db1969277cae56dbfde48e632fcfb6052628bc48880c5face592c9d9beb
font_00_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 5236 bytes
SHA-256: c92b53da23cdeb5b617a45a7207f09fa6d404b15eb6044041ee9cf097a54e489
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10808 bytes
SHA-256: 27fcdec2cd0fe1c939c32687ac3238e83a0d1e7c11ea7675575e3f9f57d043df

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