Malicious PDF — malware analysis report

Static analysis result for SHA-256 283599922721fe8b…

MALICIOUS

PDF

82.4 KB Created: 2021-04-06 17:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28cdc064b854a99f1ffdf65a48edb479 SHA-1: 73eab9e4b240ee18168ce2b1387acf74380289df SHA-256: 283599922721fe8bed4ac315afae0a9bb18b17575b5b07649b80599ae4b02a67
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mezovuduw.ru/aws?utm_term=dell+active+pen+replacement+tips
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/dca435c94c.pdf
    • https://zosomezo.weebly.com/uploads/1/3/0/9/130969149/luwuga_vonud_kemilogodego_mujit.pdf
    • https://cdn-cms.f-static.net/uploads/4376359/normal_604aac188ec9e.pdf
    • https://cdn.sqhk.co/dugelabomaw/ihbtCjf/nivupedokazofiduw.pdf
    • https://cdn.sqhk.co/pawekenu/gg1K4hg/xukesizof.pdf
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5fe53ebac496c.pdf
    • https://cdn-cms.f-static.net/uploads/4381098/normal_60252e6d3180e.pdf
    • https://cdn.sqhk.co/kopozufu/5P3Ebii/fanex.pdf
    • https://cdn-cms.f-static.net/uploads/4503874/normal_601b217e240ed.pdf
    • https://cdn-cms.f-static.net/uploads/4480382/normal_6033d64590531.pdf
    • https://benesigonej.weebly.com/uploads/1/3/1/6/131607635/dad691f7.pdf
    • https://cdn.sqhk.co/lugizumevemu/hghtdVH/cabal_mobile_2019_apk.pdf
    • https://cdn.sqhk.co/desiketomasu/fVsidig/divar_shiraz_estekhdam.pdf
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/c17b48e266.pdf
    • https://cdn.sqhk.co/noxobabidof/hevighj/moxodetiwupijexo.pdf
    • https://cdn.sqhk.co/posebozej/2nxrjdN/bandicam_free_download_filehippo.pdf
    • https://xomipuladijig.weebly.com/uploads/1/3/4/4/134401164/sowixatel.pdf
    • http://takudogifox.22web.org/bisalunixulomubilag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/womirofop/un_ipcc_climate_report_2018.pdf
    • http://danobefaxejo.rf.gd/lamopigopo.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/93927079389.pdf
    • http://nizexududitew.epizy.com/oxigen_csp_form.pdf
    • http://todosix.epizy.com/college_algebra_practice_test_with_answers.pdf
    • https://s3.amazonaws.com/fadupazageraf/android_auto_alternative_apk.pdf
    • 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_off0000fe15.bin
248de35e7ebe821e19742e6cb3036fc4ba78e108cb83533f865ca9ff6171b4f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 5140 bytes
font_01_sfnt_off00010f86.bin
06a0b2eec8e9ce2fa9e26d5fafbe5c0a025774c25ff18c3fb0b7676880d7e3c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 13396 bytes

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