Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8a000a686287f7…

MALICIOUS

PDF

81.5 KB Created: 2021-01-05 21:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ef6a6896ad6745c76c7eef80e85fced SHA-1: eb626049faeed14f57f0b9b217561d0c7cc12a98 SHA-256: 8a8a000a686287f74eca7951c56a23b8b976d464cf8d3ba321a639535fd0bd5f
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/aws?utm_term=firefox+er+file
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.pdf
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/5904663.pdf
    • https://zuwuwuxi.weebly.com/uploads/1/3/4/8/134883554/4094669a6bc88b0.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/fupad.pdf
    • https://mafakovik.weebly.com/uploads/1/3/5/3/135347242/kufifajaja_pokajegefojub_fuguketo_xexurivinake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viromibukoleliw/39365897816.pdf
    • https://s3.amazonaws.com/jepavilutabilel/student_journal_answers_chapter_7.pdf
    • https://s3.amazonaws.com/fedure/34891122495.pdf
    • https://s3.amazonaws.com/henghuili-files2/vavogasezuwozulo.pdf
    • https://s3.amazonaws.com/mokixetat/xokivogozofo.pdf
    • https://uploads.strikinglycdn.com/files/360a2f7c-f1ee-44d0-a647-725e29b1e776/vejedisejadowajod.pdf
    • https://s3.amazonaws.com/welanisowari/99948718767.pdf
    • https://uploads.strikinglycdn.com/files/685b5588-f72c-4f55-87a0-24b4edcab890/larimer_county_court_payments.pdf
    • https://s3.amazonaws.com/nezanurugega/tixedutabawaledazava.pdf
    • https://s3.amazonaws.com/lanorolowu/runnings_bismarck_nd_ad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f980.bin
dd05054d3647515836d3a812f3e57bddc42f712b30affeae1cd13e242ebaec8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 4396 bytes
font_01_sfnt_off0001087b.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 1936 bytes
font_02_sfnt_off000111ba.bin
a338c04085c007d34e8fb1ece25e5d2a866668d53a4138b5d729631af753a1d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 12032 bytes

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