Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c24c3f72772213…

MALICIOUS

PDF

87.2 KB Created: 2021-06-02 05:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3bc395d65412ed0877a03cf24ed019e1 SHA-1: ca277d216ae478a533b99292bc6a2741bda00238 SHA-256: b1c24c3f72772213ff48b2fbc1b555357bac7c9fe1107a667b59b089dc3ca4ed
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded URI pointing to 'drafthe.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to product pricing, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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.
  • 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://drafthe.ru/pbw?utm_term=how+much+is+apple+watch+series+5+44mm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401540/normal_6064e4f02599a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366995/normal_5fe11dac28446.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4401546/normal_60b373a41e686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_6016b452d7afe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5ffe9d1d2fb08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_5fe7a37a6f941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6041352b7f938.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426277/normal_60b4dee1e2d3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_604d09f1747e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_600c47d6f2834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a9cbd3-b685-466e-b888-ad9e3a8c6c0b/how_to_print_head_alignment_canon_e470.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144411867/tagowovomitetizi.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144440070/rooms_for_rent_in_reading_pa_no_credit_check.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144424704/how_to_select_electrical_cable_size.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144423348/47070347391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3121817-6b40-4634-a4ce-db205c21d918/zogivibomuduseduni.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144469260/geronemezalafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047690a5-0084-47b3-bfae-ec5f37ed0920/tarutexozebab.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/what_is_systematic_sampling_in_math.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/maxefujoja.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/90840493939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09cab162-c34f-4715-a476-61cd6edac62e/gudoladadobobud.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 4492 bytes
SHA-256: b54ee91da609211866abc9a925456056336443242ee574687843647e1df93e23
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 5436 bytes
SHA-256: 9976415d36d38631491246409637cb0f30a452b270fe7eb87515e91452cb789d
font_02_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 19292 bytes
SHA-256: d9b96c1972f9cb1b78f9269999f2795480bfc8ff5b23d9f9f59b403b4e078068
font_03_sfnt_off00013634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 16412 bytes
SHA-256: c7d06fd893a8d8904935ea93271e3b9efee096fcf0101d306bd14958e44563a1