Malicious PDF — malware analysis report

Static analysis result for SHA-256 301921b04617ad57…

MALICIOUS

PDF

97.3 KB Created: 2021-03-16 23:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4878acdee02f65fc027c03ef113f5af8 SHA-1: 28d73b4cfddcf28c519a69b0c3bfefc18a1e3fc4 SHA-256: 301921b04617ad57486daef614029d1265954ceb647dd9fd73c97c2b5a919bf1
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute further malicious content. The primary lure appears to be a fake "employee handbook" to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 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.
  • 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.
  • 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://jacksth.ru/strik?utm_term=nordstrom+the+world%2527s+shortest+employee+handbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391954/normal_60134b51c3725.pdfIn PDF document text
    • http://testrun.ru/65621188893c9ziq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_600f457f15742.pdfIn PDF document text
    • http://vorgazme.com/97196171156eho54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5fca8007101bd.pdfIn PDF document text
    • https://vituxusupodewe.weebly.com/uploads/1/3/1/3/131379836/nuxugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5fd322cc621d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fd62eae72996.pdfIn PDF document text
    • https://jevetokisavov.weebly.com/uploads/1/3/3/9/133997370/zutetov_tikelo.pdfIn PDF document text
    • http://vefuxeromuriwir.iblogger.org/automorphic_forms_and_even_unimodular_lattices.pdfIn PDF document text
    • http://prizinsta24.online/wirisuqcoi5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529149/normal_603e77a3e6fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419003/normal_601b97c9b5b1c.pdfIn PDF document text
    • https://gixeroparot.weebly.com/uploads/1/3/4/5/134586235/1b5ac142.pdfIn PDF document text
    • http://crysety.xyz/ielts_formal_letter_sample_band_9058cf.pdfIn PDF document text
    • http://jadebey-x.com/stihl_fs_90_service_manualm2msq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_60370808ceb0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5fc62ef2c64ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385028/normal_5feb95181c037.pdfIn PDF document text
    • http://rgtuitp.ru/how_long_does_a_2015_toyota_corolla_battery_lastp5vnq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozazavore.rf.gd/adobe_illustrator_free_for_android.pdfIn PDF document text
    • http://navenogu.rf.gd/bomubirexozerofasonu.pdfIn PDF document text
    • http://gexagulajiv.rf.gd/fobexeridiwagusumiwudag.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_off000137a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A4 5600 bytes
SHA-256: 8cdb3e56e9fdb53e6c928208eee572386c16b82aa1c8d95945fee30a74a427b8
font_01_sfnt_off00014a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9C 13040 bytes
SHA-256: 3f4e09dc392ed91ed10389ab4c51016712deafb1ef70bce39f571bb4aa06d9b2