Malicious PDF — malware analysis report

Static analysis result for SHA-256 052e24b8b0d374a3…

MALICIOUS

PDF

76.5 KB Created: 2020-12-19 06:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 43ed9c282e22d40c61cd7d3cb2a7e9d6 SHA-1: 911692a23f298764f2bb3f4e0a51c413d787fd32 SHA-256: 052e24b8b0d374a335f8ce56aa285f1eeeb36f86e2c99c67d7a20b9dffc84199
246 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses brand-impersonation credential phishing. 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 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/7059b.pdf.
  • 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://traffnew.ru/strik?utm_term=aaai+2020+paper+deadline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fbd250b74998.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/7059b.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/47507.pdfIn PDF document text
    • https://pikotefomulig.weebly.com/uploads/1/3/4/3/134317367/duzegakukavupaxe.pdfIn PDF document text
    • https://tapotupuj.weebly.com/uploads/1/3/4/8/134866757/91d88216a0a0.pdfIn PDF document text
    • https://munazuzane.weebly.com/uploads/1/3/4/3/134350045/6242603.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/9987251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_5fa0dcb3da6ce.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/punarabusaxi_wubinojeb_nerepamirori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc78103717a0f60c403be08/t/5fcdf443fe657040d5b610a4/1607332931988/happier_camper_hc1_bathroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56c8f2a-5e58-483e-8722-2fedced7ebf8/stanley_fatmax_700_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015dc6b3-f4bf-4fe4-be14-fc2584ca0bdd/35695866025.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_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 5036 bytes
SHA-256: 3d5ee4305ad00c4e698bdce6bf5cc0801cf549e86b5a3ab55456516196ab0910
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 10448 bytes
SHA-256: da912dd51da6a6b0bfc7fc98aa840cd023212776f8932d3da8bb9d97c22262a0

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