Malicious PDF — malware analysis report

Static analysis result for SHA-256 837c16051681f0ea…

MALICIOUS

PDF

72.0 KB Created: 2021-02-13 05:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 70038432ad1825a39d89f1c68365c09e SHA-1: 5525a666fe4238d4c2b776ae2109d63e983370ee SHA-256: 837c16051681f0ea3fc40808d70ff3cebbfc7f0867b3da21de2d351fe45627ce
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF phishing or SEO link farm attack. It contains numerous external links, with one pointing to 'jacksth.ru', suggesting a potential phishing or malicious content distribution vector. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=quinceanera+printable+planning+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5ff8b4f621e95.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/fiwura.pdfIn PDF document text
    • http://meetly.space/kogevomitudefigirowv90ab.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/niserebamobexex.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/rafiropi_xiluduk.pdfIn PDF document text
    • http://leafester.online/fusakozafl8bix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_601848eaed218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371023/normal_5fe3a26cbecbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5ff5afeeedbdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5ffb39760f10b.pdfIn PDF document text
    • https://xojajulu.weebly.com/uploads/1/3/1/3/131382271/3c1cc478a1ca5a8.pdfIn PDF document text
    • https://badobokitevobux.weebly.com/uploads/1/3/0/9/130969603/gemudumevafuxegelana.pdfIn PDF document text
    • http://todayit.pro/kizedim1vdi0.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/2809028ddaa11b9.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/naxozelozude/ruxopezomuwegilamozuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/esc_echo_guidelines_aortic_stenosis.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/fugiviwigoferixapatifu.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/77781491038.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/anthem_ayn_rand.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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 5264 bytes
SHA-256: 312088161f32c453bc5e26891a9a3235bdcee2191d79ec2dcc9b3d582c86d64c
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 10852 bytes
SHA-256: 5bf22674fe255079dcd9ce630d1bd41706134ce31e60c0659cd60e8cbd76daf0

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