Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab8f2b9f8012f4f…

MALICIOUS

PDF

103.4 KB Created: 2020-11-17 02:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7acfb08168dc767c519a9c85c88f7f6d SHA-1: dc985ce19228ba0b89d446d2eb1ef66e54dd7551 SHA-256: 9ab8f2b9f8012f4f9f966fdadca711b39a78b867034e42912dca6718b27c67b8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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/strik?utm_term=baixar+guia+dos+passos+narcoticos+an PDF link annotation
    • https://futubajo.weebly.com/uploads/1/3/4/6/134648917/888daed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fb2cbe42e65e.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/kabibig_favefawowege_lipaguma_virize.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/mezevoxinokimuwamibu.pdfIn PDF document text
    • https://xurolimusogisuw.weebly.com/uploads/1/3/4/3/134395808/3e4df6f272.pdfIn PDF document text
    • https://raminatu.weebly.com/uploads/1/3/4/5/134579417/kekekovunudisan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f893a5e77b91.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/2951351.pdfIn PDF document text
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/553970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/the_world_on_turtles_back_is_a_creation_myth_because_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d6f63a-4fee-434e-a271-df4ed0b08a0f/mistress_beast_mbs.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/99367165585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92d672a-ce38-4fcb-9f86-f75c22cb9d19/carta_responsiva_venta_de_vehiculo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7601b80b-d6f1-4acf-bfbf-ea0a16923948/short_pump_middle_school_staff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1571246f-4df6-4a15-8899-221ab551170b/pijewegaxibanovalunugup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14882 5092 bytes
SHA-256: 2d82acbea7f1541e74fd253309b1925a185f9838dfbc4cdd9e3b25e00187f0c1
font_01_sfnt_off000159da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DA 12688 bytes
SHA-256: 41cc78f9cf4d4516933ef011927a90d63605abf2452df6300f9cb5effd1bd4f1
font_02_sfnt_off00018053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18053 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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