Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cabcecf070deca…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 23:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2ce2506233ea781424c937261701b449 SHA-1: 524734b072db5446aee46b37e08daa1b745d525a SHA-256: 24cabcecf070decac78461844e7906a8789394f897d69ab8903e67e64ae443df
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://jumiwimov.ru/wix?keyword=samsung+he+washer+troubleshooting PDF link annotation
    • http://1xbets-reg.site/kuxibomasarexc8k8.pdfIn PDF document text
    • http://shop50off.info/how_to_draw_a_dog_art_for_kids_hubez1sp.pdfIn PDF document text
    • http://vittorguxx.site/372198462763hfci.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/ehgHYjh/gifixuwotigejuf.pdfIn PDF document text
    • https://cdn.sqhk.co/sobetevod/f7giD0j/monster_shooter_platinum_hack_apk.pdfIn PDF document text
    • http://trokot-tonirovka.online/forigomavulpbaz.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/hjtxzXi/watasekidetugow.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/zuvalur.pdfIn PDF document text
    • http://white-x.fun/easy_clocking_ec500_software_downloadlbh7p.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/ifgjK6c/fokuruwaketoroxomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_f6bf4eb1bd2d4207805128f30052be4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cb97c0-efc9-489b-bb67-a826de7c4275/what_does_sociological_imagination_mean_essay.pdfIn PDF document text
    • http://nebojemesiwi.atwebpages.com/aha_guidelines_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d9d4ab-5c15-4f22-b0c1-eacfd250f922/how_to_use_a_bosch_jackhammer.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_3c7cdf17b1814297bbd79d0abbd66c9f.pdf?index=trueIn PDF document text
    • https://07dfae08-e97b-4171-b1ac-1bb43c4ad649.filesusr.com/ugd/b56239_6c16b4ebbc414b5d93e82501146e977d.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_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 5432 bytes
SHA-256: b897768dfbb08095e71956b3970796fcde1d5e31b931e932b17d241c18f0aa46
font_01_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 11040 bytes
SHA-256: d1a11014d9c67c4f4192581ebf2c13b156471e61644ee67608d5e120f2030d16

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