Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc552eeee43e82b…

MALICIOUS

PDF

71.3 KB Created: 2021-01-27 14:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 322d9d81e8504bd4668de4aaf5880f22 SHA-1: 22283ff350c24e569373bacfe5cec698260a5801 SHA-256: 4dc552eeee43e82be3910978c2e183d8520fdc3662a01ab062bde76e3eead984
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data T1059.007 JavaScript

This PDF document exhibits strong indicators of a credential phishing attack, specifically impersonating PayPal to harvest user credentials or session tokens. The presence of multiple external links, including one pointing to a redirector for a PDF file, and the explicit lure for MFA confirmation, strongly suggest this malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings, such as 'SE_BRAND_CREDENTIAL_PHISH' and 'SE_MFA_LURE', are highly indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/jijatirawef.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://jacksth.ru/wb?keyword=total%20e-%20wallet%20pay%20for%20fuel%20with%20paypal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ff471b440478.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hdph5IK/57202300326.pdfIn PDF document text
    • https://cdn.sqhk.co/midipumep/iyiihgN/pulunemar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fd8ce1c89008.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/jijatirawef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_6002a1a253a1c.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/5cb48f395b9e.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/sghCgj9/30986200608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5feb0ddc13590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/fabric_softener_sheets_insect_repellent.pdfIn PDF document text
    • http://putazosaw.epizy.com/american_revolutionary_war_trivia_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/lematonapina.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/80696731951.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/bottom_navigation_activity_android_studio_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/sheet_music_app_that_turns_pages_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/meme_generator_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/les_cercles_de_la_forme_diderot_avis.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/xikape.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/50550638678.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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 4984 bytes
SHA-256: 2deb1f0c5827b84db244dcd125bd46793009eb8495790e10f7d483078fe2dd01
font_01_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 11100 bytes
SHA-256: 35b67e79737f279c3710c3e31d165dc4737babb0f09685438e07fff8ed34c399

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