Malicious PDF — malware analysis report

Static analysis result for SHA-256 3191f6773214c338…

MALICIOUS

PDF

71.0 KB Created: 2021-03-05 12:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ea25c276f781f8f5a38f147775a0941d SHA-1: 795498203f7ce8c3f58da0bc12e814c68f018416 SHA-256: 3191f6773214c338d847e1a48ccc44d275481be7407ca6ef1c1be4cc544fbce0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=fe+handbook+9.5 PDF link annotation
    • http://sunshop.pro/45106213950cmfac.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/bUPdije/kapiruzebulamusenomezaro.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/dghSQu7/suvotisu.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/cigCjfx/milk_processing_factory_crossword_clue.pdfIn PDF document text
    • http://zikifogomi.22web.org/lego_marvel_superheroes_game_android_app.pdfIn PDF document text
    • http://reduslim-italy.site/461381851689j4o5.pdfIn PDF document text
    • http://899themes-demo.ru/62399102660tdg2m.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/jiihIDc/platform_io_fastled.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/dhieiez/54596324393.pdfIn PDF document text
    • http://uber-global.com/fitbit_versa_lite_does_not_syncr4w91.pdfIn PDF document text
    • http://uniques.space/opposite_adjectives_esl_worksheeti6j4t.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/jy7Huhh/rixonofido.pdfIn PDF document text
    • https://cdn.sqhk.co/vofemolat/dtzPgh6/sinizemosevewe.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
    • http://gasigigi.rf.gd/63751992537.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_03df6fc8d68d4165b20a5967ba41dd6b.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_13f2111d29384fc2a38e2941bd3bae09.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_0b73271be62545c48ed8d1674418ce8d.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_657b11b21efa4760a479dbcd6ed2e32c.pdf?index=trueIn PDF document text
    • http://fupotuz.rf.gd/33177018205.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_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 4740 bytes
SHA-256: 3905d9ca518d91aad5269be9f5bbe38c5b1c4ccb50b8fd4fda9b0f1f03cea729
font_01_sfnt_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 10232 bytes
SHA-256: f8025ebf608091de65627aa455f8bd6f11a5355b73ef75a6df08ab5fc41047fb
font_02_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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