Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0b96b0f8a8dcc8…

MALICIOUS

PDF

87.8 KB Created: 2021-03-17 17:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0143a801b119362eeda0650d43d2c280 SHA-1: 2c66f4d9b6e534131a98053d9a77d7c18898c32b SHA-256: cd0b96b0f8a8dcc85ec35dc5b9880496102b80b3a31c44de9ded1cce40ae3c9f
186 Risk Score

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://botokaw.ru/123?utm_term=fv+annuity+table+pdf PDF link annotation
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/180550.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/3a677f74e.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/ehcjcKq/motozudefivatuxor.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/5199605.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/bngghdL/711739762.pdfIn PDF document text
    • http://ecoservice-vlad.ru/becoming_an_entrepreneurdney6.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/gazidazoxotararaset.pdfIn PDF document text
    • https://cdn.sqhk.co/wusoxopejezo/ji4tigk/tiktok_downloader_no_watermark_app.pdfIn PDF document text
    • https://cdn.sqhk.co/juvexafi/jfjiJhg/game_maker_studio_1_download_crackeado.pdfIn PDF document text
    • http://about-fb-support.com/how_does_molecular_shape_and_polarity_of_bonds_affect_boiling_and_melting_pointsittqk.pdfIn PDF document text
    • https://cdn.sqhk.co/buvoxinas/MiIigbo/niledafinexasapi.pdfIn PDF document text
    • http://senteber.site/16253360427wi83z.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/vukujidor/97500767167.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_179de8c9abee417ab31ec5c8e9965e86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekife/alif_novel_episode_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/7153489749.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_3bde12d8d103429b9b426d92fb70cb7a.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_a1da7b24ba284c27bd290ca34c36c640.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_3190e7d9f7944546bba815943bd4f0b0.pdf?index=trueIn 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_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 5020 bytes
SHA-256: 9c795b12b5e2f2e5b85a7e14d6004868c9ad9e1a2bcaa8e0d310ace5fa7bcb4a
font_01_sfnt_off00012ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 11656 bytes
SHA-256: cb47b78147edad5bac7d59766cc2c6634f00478b15ddb157f08d6d43213302e1

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