Malicious PDF — malware analysis report

Static analysis result for SHA-256 3523f6a4dcaf70f5…

MALICIOUS

PDF

69.3 KB Created: 2021-04-04 07:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4379a816c637180fa1c2bc02172580de SHA-1: 86d179a5a5abb905a000a991a69ddab3b99da534 SHA-256: 3523f6a4dcaf70f5acbdebd8052d2dbfbff1060d1dbf7d751de8cb60ae1ffe84
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

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://fokemale.ru/123?utm_term=android+apk+iphone+ipa PDF link annotation
    • http://drenajkrasnodar.ru/sec_sda_church_directoryn8ozu.pdfIn PDF document text
    • http://obmenkalnr.online/knife_set_sale_australiaig1b5.pdfIn PDF document text
    • http://ehaberdevlet.com/2865279017proam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_5fd34d1cf06f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528260/normal_5ff37f2a906cb.pdfIn PDF document text
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/kofaripobafuf-sejefakuridowij-xenolipogawugo-fategodeg.pdfIn PDF document text
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/4875262.pdfIn PDF document text
    • https://fofupapezu.weebly.com/uploads/1/3/4/3/134356394/waxux-bupodoruju-wasujaw.pdfIn PDF document text
    • http://itrom.fun/what_is_a_demand_letter6fnub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501996/normal_601ee842185f1.pdfIn PDF document text
    • https://xemavuvewo.weebly.com/uploads/1/3/5/3/135394060/warazeluwekejow_welukel_subixegoka.pdfIn PDF document text
    • http://trastqort.online/dozikonegotadisipugunomkg052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef2302c-843b-4169-a372-c79c8a7fec35/libro_de_geografia_5_grado_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/kilugapebogilalos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691d5b8e-c228-4e2d-b92c-a7729269f079/the_shadow_rising_cover_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550f9d73-f5e7-4086-bc2f-7340d7b0a525/nowikima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52639399-9d7b-4d7a-b5a6-c51099a7cc7e/64383166986.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_da63d148862248f7a3bcb424ccc8329b.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_a74e47fa47434be388df6c2c3e40c225.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_51c54f07efaa4c3695a57a0e12c4c4fb.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_0bec5292da5648b7b58fa28bb0fbc518.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/luligubipipo.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/decimal_shading_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/7361687362.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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 4892 bytes
SHA-256: c75ee225dea168dbbf9d95d438de2a68730d48fbc5e6ae7d0e437b252aef6016
font_01_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 10292 bytes
SHA-256: 2f7181f81f5a7e5e7805dfd5883f266da6aea659521d6024888f33dba65b2ba6

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