Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bf594ebb871c85…

MALICIOUS

PDF

74.5 KB Created: 2021-05-07 05:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: acc842280359bc37c29becb5f1d21dd1 SHA-1: 282b63a3e36ebf56e86a7d00008bc86e0e376bad SHA-256: a1bf594ebb871c8518e45be1ede7eca45c5d7a4403c8c4b8bd9b615660420643
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document is classified as malicious and exhibits characteristics of a credential phishing attack, specifically impersonating Amazon. It contains multiple embedded URLs, including a redirector, that likely lead to a phishing page. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' strongly indicates this intent, and the presence of external URIs and a link farm further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jikidamasot.weebly.com/uploads/1/3/4/8/134874174/pazanuturejileb.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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/strik?utm_term=how+do+you+reset+the+control+lock+on+a+whirlpool+washer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406771/normal_6000f3ab50dd0.pdfIn PDF document text
    • https://jikidamasot.weebly.com/uploads/1/3/4/8/134874174/pazanuturejileb.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/9907e7aa5b65d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_5fe102b0683ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_606e8d3da303a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5ff98ea35c34d.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/kixira-vujixopiwodediw-fisazixejezij-xufusuputajen.pdfIn PDF document text
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/1427381.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/a6dcc023185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_604fa4f532b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_60565fa3e3be7.pdfIn PDF document text
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/xezutikurodoji.pdfIn PDF document text
    • https://zofetofevikid.weebly.com/uploads/1/3/4/3/134337570/rarokedafiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_60254d35b543d.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/a5da5f16-b3cf-4212-9599-f532b8779744/bipadamikevirasazoritaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9a8b77-cad6-4970-a7f5-18cbcf5de82a/86008048844.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/veliv.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/7390708850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61a217b-d31b-44e6-a9f6-38371e096230/divx_converter_serial_number_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/mazikizemugop.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_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 5380 bytes
SHA-256: 94f34379c1240b56d27fb4f87f4a2ae4d67eb152f3d331c529ea30fdf65dcede
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 10712 bytes
SHA-256: 58cd9aaa75137323eb6bb093d3b15b0b874d772b7c5e491ed71cc9830a7f7eb5