Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c5eff43fe27adb…

MALICIOUS

PDF

74.9 KB Created: 2021-02-07 08:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0161876814bdcc401658f57076ae43dc SHA-1: 3ed97d7e9f6c8fe625f6da1d57bb640da346211b SHA-256: 35c5eff43fe27adbf62d303c2f994393ce6c4f0be50116d78985e05ad1c3f5c0
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Credentials from Password Stores T1056.004 Web Browser

This PDF file is identified as malicious by multiple heuristics, including ML classification and ClamAV, and is specifically flagged for brand-impersonation credential phishing, impersonating WhatsApp. The document contains a mass external PDF link farm, suggesting it is designed to host numerous phishing lures. The presence of MFA/one-time-code harvesting lures indicates an attempt to steal session tokens or bypass multi-factor authentication.

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://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/568927.pdf.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/aws?utm_term=nnamdi+azikiwe+university+post+utme+form+2018 PDF link annotation
    • http://tugrull.com/muwuwovumokalulujepiba3x157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491412/normal_5fe477bac0259.pdfIn PDF document text
    • http://qwonder.space/outfox_sandra_brownzui73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fe2aa071b3c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366628/normal_5fce5b40224d5.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/568927.pdfIn PDF document text
    • http://lodujenoxo.iblogger.org/online_guided_reading_level_assessment.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410431/normal_5fcb2ea4f22aa.pdfIn PDF document text
    • http://radanews.site/nukukonezamokoxukizivixagn5hmk.pdfIn PDF document text
    • http://yoganchik.space/kuensel_calendar_2019_downloadj1dj1.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/numuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421042/normal_5fc6651f75f42.pdfIn PDF document text
    • http://ziguzuxudatigu.22web.org/zadanuma.pdfIn PDF document text
    • https://jelugofinetala.weebly.com/uploads/1/3/5/3/135389066/109399.pdfIn PDF document text
    • http://portal.unizik.edu.ng/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xipipowateselok.epizy.com/examples_of_spreadsheet_software_programs.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/3d_lut_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/free_templates_for_cocktail_party_invitations.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/jaxetigupivuvijigo.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/simple_invoice_template_html.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/bedufetexakaguvezedepo.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_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 6012 bytes
SHA-256: 2a58f265d73f5ccac429f8265136b631701cf7bb711c250589d3ec990e0d3216
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 10896 bytes
SHA-256: 375bce46270e615ace19fb63d544c1abb3b43401fd0140d1c5058b1bcaafed8f

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