Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b202b53664c6eeb…

MALICIOUS

PDF

78.1 KB Created: 2021-06-08 17:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce010e620a14496368b5f6674232cdd SHA-1: 6991affc5d5b76837e6385d3a3dc23e54717d7db SHA-256: 2b202b53664c6eebb7b9c0f20e14a9324f660aca5e67b1b525a90501848f01fc
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://archism.ru/pbw?utm_term=speaker+volume+booster+apk
    • https://cdn-cms.f-static.net/uploads/4481825/normal_6061912e060b8.pdf
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5ffe4242d05b3.pdf
    • https://sinukunub.weebly.com/uploads/1/3/4/4/134431456/vubani.pdf
    • https://nisazixipa.weebly.com/uploads/1/3/0/7/130775104/a61fd.pdf
    • https://static.s123-cdn-static.com/uploads/4455406/normal_5fed5a68f0471.pdf
    • https://pijolonaponezu.weebly.com/uploads/1/3/4/8/134879261/tiduloforomimakeji.pdf
    • https://cdn-cms.f-static.net/uploads/4488092/normal_603df8b823736.pdf
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/248539.pdf
    • https://bonopabugo.weebly.com/uploads/1/3/4/5/134581776/7005404.pdf
    • https://cdn-cms.f-static.net/uploads/4484805/normal_6051703f902b3.pdf
    • https://duvigenusidila.weebly.com/uploads/1/3/4/7/134736387/laverakakolivujo.pdf
    • https://pakitaxe.weebly.com/uploads/1/3/4/3/134318313/1c60e.pdf
    • https://nikigefewava.weebly.com/uploads/1/3/0/7/130775032/ac13baf392933af.pdf
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/6690551.pdf
    • https://losulojer.weebly.com/uploads/1/3/0/7/130739206/d105ee1.pdf
    • https://gonuzefokuko.weebly.com/uploads/1/3/4/1/134109069/novujerepu.pdf
    • https://fevadejo.weebly.com/uploads/1/3/0/8/130814338/b39d7.pdf
    • https://puxonuge.weebly.com/uploads/1/3/1/3/131383548/c9aae3b6850a9.pdf
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/desotok.pdf
    • https://cdn-cms.f-static.net/uploads/4368503/normal_60bdedc5a260b.pdf
    • https://xiwupezarevapo.weebly.com/uploads/1/3/2/6/132681984/7145602.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6db7f632-c659-4842-9656-d9edc4be6175/sawejiper.pdf
    • https://uploads.strikinglycdn.com/files/0d1dc338-2e31-4c63-8fc1-d9f947aa2f11/lg_side_by_side_refrigerator_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/a193eefa-60b6-4ac2-afc4-9786f4ebb907/nemam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e606.bin
09616df82462c19f5be7ca7dfb17e81098a9bb86a9d044c2d80ee1e4232be738
pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 5332 bytes
font_01_sfnt_off0000f80b.bin
bf13f20f3eb794e462ee31670a6bfbc8e5a47ff4dbe717f0a936ae4cf50244db
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 3296 bytes
font_02_sfnt_off0001055a.bin
07cfb4f28afb53472b61440c9dd2634bd932ed299cf8aa50dba6dd15dd378ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 10868 bytes