Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffba450add9469ca…

MALICIOUS

PDF

66.1 KB Created: 2020-12-22 00:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f78c832c1bb685e9fe8b51bd9586f2a4 SHA-1: edc252378f8f9714ea0162e1a01f934187d0e1d7 SHA-256: ffba450add9469cacd2f0ab7ff0a6b7a2cf03be12d8f3721edbd0d96bc6918f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=worcester+to+boston+train+fare PDF link annotation
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/8dda8620dcd.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/9f789674cf550.pdfIn PDF document text
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/zonojugeg-susuzozot-guneti-meranisafudafa.pdfIn PDF document text
    • https://meritogaxubov.weebly.com/uploads/1/3/4/7/134767100/4820228.pdfIn PDF document text
    • https://pajedurozibije.weebly.com/uploads/1/3/4/4/134446399/b09e33250bea87.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/vifusupegiza/solid_creator_9.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd980e0-721f-4714-8053-4194d0088fb4/ar_test_questions_for_twilight.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce3d6c8a652741489ba5e5/t/5fd6af5713a48350e81e5cde/1607905115790/gaxolitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2a4f05-83b3-4cc9-8cba-0ab547684176/adobe_media_encoder_cs6_vs_cc.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/komewolisoxukaninaturuzuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/desarrollo_evolutivo_del_cerebro_humano.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_off0000c5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F6 4996 bytes
SHA-256: 2bff5694ea8597be72a675f0a0bd9403751d132f7ebe3aa728a2ac63358a18f2
font_01_sfnt_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 10852 bytes
SHA-256: d27993314a33ab65c993a49090ef18585252a12ff79f1300b2e202820af71461

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