Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a209ef910766f73…

MALICIOUS

PDF

294.5 KB Created: 2020-12-23 01:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f706c2131fbb39f7c59ae43dedfa7e7f SHA-1: 5e456b96b8c74debba49c8e360c2098d55977c68 SHA-256: 7a209ef910766f73e3f16eb07d6637c7a5896a18374a638813226e006f82eb60
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically impersonating USPS to lure users. The ML classifier and heuristic firings strongly indicate a phishing and redirection attack. The document body, though partially garbled, mentions interview questions, aligning with a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/pogadutevubuguditeve.pdf.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://ggtraff.ru/aws?utm_term=difficult+hr+interview+questions+and+answers In PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/pogadutevubuguditeve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5fde5ad64ae25.pdfIn PDF document text
    • https://nudonadutosaj.weebly.com/uploads/1/3/4/5/134595964/00d86b9f7e9e0.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/konazumobifaw-vigureno-mosigokanis.pdfIn PDF document text
    • https://zomawetojenil.weebly.com/uploads/1/3/4/3/134331930/buwivitirume.pdfIn PDF document text
    • https://bavopubenexe.weebly.com/uploads/1/3/4/6/134678362/tuwumufovezosux_nutovuva.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/5fc35e67cd1e280355e3f728/t/5fcb6b70a3bc3d19152e0feb/1607166836005/word_cookies_halloween_event_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/catalogo_ikea_2018_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa9172a-4d06-47e9-aef5-58749ae339c3/effie_hunger_games_butterfly_costume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec3c7de-1470-4bf0-8110-1203a3dce11c/sekoxibugi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1a9b80b6b03258f3af046/t/5fcf1b6cb8233e30dfa4361b/1607408492743/dovog.pdfIn PDF document text
    • https://analytics.tdameritrade.com/clickstream-v1/events,olaRedirectUrl:http://www.tIn 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_off00044a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44A04 5384 bytes
SHA-256: fc8c0bdac3977a3472c1abab3c1b029129b1c44f3d2286fb5cf3cdb5b397fb7b
font_01_sfnt_off00045c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45C66 14588 bytes
SHA-256: 8d924b13f16ce27f7470e2a111dff5fb44059794c6bb6c9f1cd22f1f11134094

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