Malicious PDF — malware analysis report

Static analysis result for SHA-256 a443d8bf3669ad99…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 08:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 228b4e8c8ce5112e0827352af5d39d96 SHA-1: f19a9449dc2813e3a984256b183d7efc50551f2b SHA-256: a443d8bf3669ad9957ceee180c781a7202596fc30f671403b4869beac3cfcadb
146 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a callback phishing lure. It contains numerous external URIs, with one prominent URL pointing to a domain associated with malicious activity. The document body, though heavily obfuscated, suggests a lure related to immigration records, likely to trick the user into initiating contact. No scripts were extracted, but the PDF structure and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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://resalured.ru/strik?utm_term=how+long+are+immigration+records+kept PDF link annotation
    • http://glossywp.online/85783011953iwecz.pdfIn PDF document text
    • http://hookup754.fun/report_elderly_abuse_louisiana3epr4.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/93670754291.pdfIn PDF document text
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/ec39ce8697c.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/what_is_the_definition_of_tone_in_poetry59v9h.pdfIn PDF document text
    • http://berezarivire.iblogger.org/77391967791.pdfIn PDF document text
    • http://tesar-krd.ru/platform_meaning_of_marathi_language7ld8a.pdfIn PDF document text
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/9213561.pdfIn PDF document text
    • https://mexilaret.weebly.com/uploads/1/3/0/7/130775974/gizupibeki.pdfIn PDF document text
    • https://rinosebamajipem.weebly.com/uploads/1/3/4/6/134694393/pozositamaze.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/automatic_voltage_regulator_avr.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/gifojuxaxeva/xozewugofut.pdfIn PDF document text
    • http://wexoloxi.rf.gd/munelenanepop.pdfIn PDF document text
    • http://livibof.rf.gd/zomiw.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/fewokalozelanuru.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/image_size_cutter_software_free.pdfIn PDF document text
    • http://xapemekofutomun.rf.gd/kogikanefibutuxe.pdfIn PDF document text
    • http://jidowadosul.epizy.com/18689652426.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_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 5508 bytes
SHA-256: f091a4e2b5c64134f0bebe8240bb736b9b64010727dcea99a01218a77f0263f5
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 10652 bytes
SHA-256: 63afccba8afa8a642ae31a8b6f20181533f0be2bc7cc1c3735583604319e1f56

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