Malicious PDF — malware analysis report

Static analysis result for SHA-256 1250da69f15e0b77…

MALICIOUS

PDF

79.9 KB Created: 2021-03-18 21:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 613790266758c63ceaee4c82689ae669 SHA-1: 7a51ecb1f18d93ff7ac61aa701a7563ee8bf2d2f SHA-256: 1250da69f15e0b77514e3fead504cad2b2e12eb6c5625e8497cb787e0b931c00
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and specifically as a credential phishing lure impersonating Bank of America. The document body, though heavily obfuscated, contains references to investing and stock markets, likely a pretext to direct users to malicious URLs. The presence of external URIs and a link farm on disposable hosting further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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://susawodaf.weebly.com/uploads/1/3/2/8/132814942/zifam-gipegiwefidar-xikebusaxodanix.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://zajinet.ru/strik?utm_term=how+to+invest+money+in+stock+market+first+time PDF link annotation
    • https://susawodaf.weebly.com/uploads/1/3/2/8/132814942/zifam-gipegiwefidar-xikebusaxodanix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5ff59c558ef6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371023/normal_5fc9c89a75193.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/nimixaxilasiban.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499021/normal_5ffe6d6aebbd7.pdfIn PDF document text
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/0641165.pdfIn PDF document text
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/xizoxuzamatul_xexidawir_xogilif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vitivewizonomaw.epizy.com/chuyn_i_sang_jpg_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a422ae63-02f6-4f16-9bee-2c1a37952bd3/what_is_a_ledger_card_in_accounting.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_acaf264501bc40019a1bd53258366f84.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_a048a6fc1a854a8493fbda7dfc5b077c.pdf?index=trueIn PDF document text
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_b9d3f61e30dd47c4ad24f46ffb9d643a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea326b4-e5e5-48e8-8c7b-a404405d6114/que_es_fotografia_artistica.pdfIn PDF document text
    • http://torumaxot.rf.gd/94007753016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b48962a-208e-4328-b589-6f27cd0e9a3b/98418275616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920865b9-9027-4b81-9449-4c12e993c9da/what_does_the_bible_say_about_divorced_couples_remarrying.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_9cd5a1e233c440089dc8d2bfa26633ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b671ebfd-84e1-427a-a984-ff7f4b2cc75e/words_that_start_with_postman.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_b07b5d59a3294c43b889cbe5aed81fd7.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_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 5276 bytes
SHA-256: 0fcfd37444bacc6c9f89ab7f02d9cc99ebaf00ca3e70e11364b16bb04338c04d
font_01_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 12184 bytes
SHA-256: 22dad806fa9fbf8c8c6916e5b091b77dce0d6a7c7c4aa780407ae858498986f8