Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a6def4a90ce141…

MALICIOUS

PDF

76.1 KB Created: 2021-04-07 13:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 167480a34ab8250a92d4a0c79c6ffec8 SHA-1: b64776154c13092e5258da27132faa73a6f55876 SHA-256: 80a6def4a90ce141da7122a450877bc32d11e0b25b35406011bbed8e48350bf4
154 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified as a link farm on disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'Wordpress user management' and includes a call-to-action phrase, consistent with a phishing or malware delivery attempt.

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 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/aws?utm_term=wordpress+user+management PDF link annotation
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/9b56fe8ee2687d.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/wuginesatadox.pdfIn PDF document text
    • https://metoxuxiduwano.weebly.com/uploads/1/3/1/6/131636764/turazubi_vawefosuponuz.pdfIn PDF document text
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/3360174.pdfIn PDF document text
    • https://tupalomixesitet.weebly.com/uploads/1/3/1/3/131379559/89f4c433c8f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_606b603bcf10d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_602db093c1e82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_83fdcf8fdc1b4475b0d9ea68ae029285.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26fa79d3-6005-4c76-9e0e-8cae2c6ed9c5/paige_spiranac_best_ranking.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/who_dies_in_the_book_the_blood_of_olympus.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/zubesoragotam.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_cc9af4dbd14142e49ea18358bc745ce7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55855e94-504d-457a-909b-48fbd3a982e5/marketing_management_salary_per_month_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bf29ca-0c45-4998-aba2-b5a480bf5a26/96516980561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ec38e7-a5de-442e-9933-61527ebbcda7/sabunizuf.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/excel_macro_sheet_select_using_variable.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/xinanotezixekibu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/reset_emerson_wifi_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/caracteristicas_del_materialismo.pdfIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_d740d17a237b428fb4fd5239c357428a.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_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 5260 bytes
SHA-256: 99fc74d313813b26417dc1209703101d9da10142653aa843e29f9d1ef0fc5c2e
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 10388 bytes
SHA-256: 27aad5322d7c4732d9777dae72ae085852d067196773c9096cee590f175af970