Malicious PDF — malware analysis report

Static analysis result for SHA-256 7644495eca17e642…

MALICIOUS

PDF

78.9 KB Created: 2021-04-16 04:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19e78f1f71bddf683f35650c116e49b0 SHA-1: 2f381b3bb4ced98e461eaf93c470e8e689bfc5ad SHA-256: 7644495eca17e642957470e36b8d096b5c0e574561da604b72cab8398d0af5a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a deliberate effort to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=is+acer+spin+1+a+good+laptop
    • http://tawaguf.scienceontheweb.net/bevepuzemagipi.pdf
    • https://fixogamirumi.weebly.com/uploads/1/3/4/7/134715439/3380959.pdf
    • https://bejokezogakuji.weebly.com/uploads/1/3/2/6/132695802/xufozedoneweta.pdf
    • https://tagopebarezixog.weebly.com/uploads/1/3/1/6/131607889/b85ce5af.pdf
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/2ae8c5.pdf
    • http://jipujitematane.iblogger.org/17816218597.pdf
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5fe1d2c54f657.pdf
    • http://suvolupijiro.mygamesonline.org/genomic_and_cdna_library.pdf
    • https://cdn-cms.f-static.net/uploads/4447276/normal_60692d0232c32.pdf
    • http://wolifote.getenjoyment.net/xasesetomisikiwagevivikaz.pdf
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/7831906.pdf
    • http://betijeduw.getenjoyment.net/ray_ban_black_aviator_sunglasses_price_india.pdf
    • http://denarop.22web.org/zexixujoxepigumajolego.pdf
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/abec458b6e0.pdf
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/gojivetizabawukitumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_ea087058058b4727bad52c2dcc5c0ef7.pdf?index=true
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_f73097bd3f6640adac27ddb82dcb7e21.pdf?index=true
    • http://vajexakatozezal.epizy.com/how_many_questions_are_asked_from_inorganic_chemistry_in_neet.pdf
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_263baf1e166d49349463869a37948a35.pdf?index=true
    • http://bilalukaseka.rf.gd/pefoburuzagob.pdf
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_a64a4d685e044181b2c2e51cb8b831b6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f782.bin
601b15f9e0e415ca9165e0cce725c98138b44d1e927fb1e997cb4b04cced349f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 5228 bytes
font_01_sfnt_off0001095f.bin
8627cd345924bd6c16be77d9829d437cf5b302e9bce3bbfff87865bc125aadf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 10736 bytes

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