Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b70cf20e71a424…

MALICIOUS

PDF

82.7 KB Created: 2021-04-05 01:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e52a523047bfcfd32829647802553aa4 SHA-1: b0c7da5fe986275c2235ab3bacab8d589069569c SHA-256: 38b70cf20e71a424e8570c9022a022a8dc2c0497744a342e4d77041b68fce747
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/strik?utm_term=jane+austen+movies+ranked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470688/normal_6023d223d5356.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/giklpsr/14813749786.pdfIn PDF document text
    • https://cdn.sqhk.co/xafogatok/igha8ic/43806402333.pdfIn PDF document text
    • https://pagopolekabob.weebly.com/uploads/1/3/4/3/134305888/4788778.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/Ujgacmb/mebobodogeleteduwudunis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_60290c07c20d0.pdfIn PDF document text
    • https://jimiduwukav.weebly.com/uploads/1/3/1/4/131452794/noritimazazadefuteli.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/fjjGRdb/jazz_super_call_offer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_5fcd527e93719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485166/normal_60249981dfff4.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/Ughghq4/kadujipenifine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_af120945dbdb4bbebb3149d632cb3f34.pdf?index=trueIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_cb696b504b8b409e8358d71adbf55c0a.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_03d387111f6f4bbdbaea2761da885a0c.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_4dad5b45ce13497b92e98b268f57ec45.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_b3122488e761492ba80911b38d280628.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedesowul/88250693218.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/dress_code_business_formal_women_s.pdfIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_8063f5a2e1434a5d8c76ec8605a62f49.pdf?index=trueIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_98a9b859fffd49a69531e42398caf6a4.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_438af2c8ea7d43edb35d87e8b1041a3e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 4936 bytes
SHA-256: 9aaa0feca6fcea0b315c10f61d1d71d6022548f1073d880633665476cf0787f8
font_01_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 11080 bytes
SHA-256: ed2671e42c03e688ecb57687a318c1dd1c404c71477cad0bc19091ffe7d558a4
font_02_sfnt_off00012fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34