Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8882c62b2b76d80…

MALICIOUS

PDF

151.2 KB Created: 2021-03-29 13:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 630c5ef98cf4fbf45118a6c77f703e12 SHA-1: 107162f952f3a3cd7382d9e0d3502b1307ed88f0 SHA-256: c8882c62b2b76d8080cde762ac77644690876327ec074308bd27e46df4ff574b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains an embedded URL that redirects to a suspicious domain, likely intended for phishing or malware distribution. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The document body, though heavily obfuscated, contains text related to search terms, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=artificial+neural+network+define PDF link annotation
    • http://zisezamerares.mygamesonline.org/51294470820.pdfIn PDF document text
    • http://xovuwut.iblogger.org/nanazajena.pdfIn PDF document text
    • http://kafojiv.iblogger.org/assinatura_digital_em_documentos.pdfIn PDF document text
    • http://rimiminigi.22web.org/3822595540.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/kateralaxirem.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/wolutalorasupabo.pdfIn PDF document text
    • http://xaxifibipebux.iblogger.org/59121649633.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/45471809852.pdfIn PDF document text
    • http://limezage.scienceontheweb.net/algebra_motion_problems_with_solutions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_9ff4e38028ed43d7b5e624d88cf89b78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/biochrom_30_amino_acid_analyzer_manual.pdfIn PDF document text
    • https://4fd7ac12-06e8-439c-96a9-7636004ccb32.filesusr.com/ugd/9554ab_45f5b48d6d6e495298114d61f0ea8c53.pdf?index=trueIn PDF document text
    • http://fuginifetulad.epizy.com/povilukowitosajoriz.pdfIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_3536c1dd9e7a4ce28ea75f261d656aea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/97869540079.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_a169937e4c184791bb6062c5504dac3a.pdf?index=trueIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/57501480713.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/87636183370.pdfIn PDF document text
    • http://nopuxawox.epizy.com/teori_ekosentrisme.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/78602554750.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD5E 4984 bytes
SHA-256: 9f6407f4b1f927ce56c003b70e3a2b55179afcd708d2f90f0b9294e7d0b523b7
font_01_sfnt_off00020e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E72 13048 bytes
SHA-256: 1397b451a61a8a28c14d77f6e831bd331fb9899b87c9351b25ee7e1680ec8c99
font_02_sfnt_off00023823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23823 16224 bytes
SHA-256: dc279158ecdd0375b4819925baa6f9a5ec2e7ff2bbde181d1cd53e1c8e6de189

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