Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe90586f6243cd43…

MALICIOUS

PDF

86.2 KB Created: 2021-06-06 15:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba981ae9cb08c1ec3d0d2eaed4a8e18 SHA-1: e8b83dfc869309484eda49da5a3adb95284be9ad SHA-256: fe90586f6243cd43bf6ec60e23fd08d9bf6f6e63821542f4abd1077bfed56c30
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. One of the embedded URLs, https://archism.ru/pbw?utm_term=theft+from+shop+sentencing+guidelines+uk, is presented as a lure related to legal guidelines, likely to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/pbw?utm_term=theft+from+shop+sentencing+guidelines+uk
    • https://cdn-cms.f-static.net/uploads/4417643/normal_606e444e5ddec.pdf
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5fd6232cc0798.pdf
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/xoxonovuvax-jigodefowexodav-siribomoko-fidiporenakam.pdf
    • https://lopufofogepuxal.weebly.com/uploads/1/3/4/6/134695200/05c5bdfeb.pdf
    • https://cdn-cms.f-static.net/uploads/4479210/normal_605069652a7a5.pdf
    • https://cdn-cms.f-static.net/uploads/4426960/normal_606e9cce80610.pdf
    • https://saxijafuduzota.weebly.com/uploads/1/3/4/6/134692269/a9d9bb801.pdf
    • https://cdn-cms.f-static.net/uploads/4487424/normal_5fd894625897e.pdf
    • https://cdn-cms.f-static.net/uploads/4388814/normal_605ee8c8e386a.pdf
    • https://cdn-cms.f-static.net/uploads/4494674/normal_603a24365dd31.pdf
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5ff258054c14f.pdf
    • https://static.s123-cdn-static.com/uploads/4389370/normal_5fe5ea48cb839.pdf
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fffc0e893fb2.pdf
    • https://cdn-cms.f-static.net/uploads/4386609/normal_60185dc7c76d5.pdf
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5fddbe9e2f71b.pdf
    • https://static.s123-cdn-static.com/uploads/4456712/normal_60053ccd21f91.pdf
    • https://gekirexuwiri.weebly.com/uploads/1/3/1/4/131452917/eae47f9.pdf
    • https://static.s123-cdn-static.com/uploads/4493200/normal_6004dec6a24b7.pdf
    • https://cdn-cms.f-static.net/uploads/4380700/normal_6012950919468.pdf
    • https://static.s123-cdn-static.com/uploads/4375509/normal_5ff7848891b55.pdf
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/5d3f0b62c06e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mojuseraneno.pbworks.com/f/traffic_rider_son_srm_hile_apk_cepde.pdf
    • http://joraxakegeg.pbworks.com/f/30247653067.pdf
    • http://bojifimaral.pbworks.com/f/download_all_tintin_comics.pdf
    • http://fujiserefi.pbworks.com/w/file/fetch/144582675/pokemon_sun_and_moon_gba_zip_download.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_off00011327.bin
6f15cc3e4dbbba929297efd4ee38aaf20f633039bd26ef6bd69319ba8862acff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 5372 bytes
font_01_sfnt_off0001254a.bin
fa5f745aac5efed3e15027568b6dbf5603d193a179b274019f888dee3769da52
pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 11408 bytes