Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1a1a70d8fcf245…

MALICIOUS

PDF

145.9 KB Created: 2021-03-17 04:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e38d3daef89dbc3da1ed49a399fb8698 SHA-1: 08225130fd942ab01e934646012ebbf951f8f42e SHA-256: 7f1a1a70d8fcf245b68accb281b41218bfd14df64b72829b9fe60155a53c5d2b
246 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing (Walmart) and a high-confidence ML classification. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The primary lure appears to be related to 'how does a disabled person qualify for medicaid', directing users to a redirector URL that ultimately leads to a PDF hosted on Weebly, impersonating Walmart.

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
  • 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://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/3919386.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://bologen.ru/strik?utm_term=how+does+a+disabled+person+qualify+for+medicaid PDF link annotation
    • https://cdn.sqhk.co/doburazax/Mnjb9id/photo_eraser_for_pc_free.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/3919386.pdfIn PDF document text
    • https://petenugilamabo.weebly.com/uploads/1/3/1/4/131453278/2581449.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/le_marxisme_pour_les_nuls.pdfIn PDF document text
    • https://gosikemimikivum.weebly.com/uploads/1/3/4/6/134674661/wetewijen-merasurirox.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/Cggjhgg/gudekatojon.pdfIn PDF document text
    • https://cdn.sqhk.co/sinewuvemomi/nQYidmg/6049220725.pdfIn PDF document text
    • https://cdn.sqhk.co/gulaxemetila/3ihljeK/58743395764.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/jid0tih/vedudurunufuk.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/Wjghhij/roku_stick_plus_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/gi2ojbe/lily_s_garden_cheats_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/jXjdbhd/march_2019_sat_answer_explanations.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/c1cecefa-1219-46e4-b2d0-85ae25ad495d/xafavukumuvabo.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/wudizute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f7f8bf-eb54-4ded-987a-1ab546c7a9d1/wilifofeped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dfffdfc-1759-4564-9c3b-33e097b989fc/first_oration_against_catiline.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_b7bb7bbece03426cbf65c5d4b8f9ddea.pdf?index=trueIn PDF document text
    • http://tudugir.atwebpages.com/fafupimetanareladilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d2e955-24b3-44f9-9703-70ae12cd4499/82661335780.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_6331c94b4c8141a98ff4931b94c5f8d4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF81 5720 bytes
SHA-256: af09a534305a78deca4602a282155e1dda7f3b4ccc14f58e7493894c978ed68b
font_01_sfnt_off000212f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212F2 11360 bytes
SHA-256: 8b1255d7f4c2aa749ff5923c365a80cc9a1aff279c99d06195e2cf1c4cd6d707

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