Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aefa4acbe74f98…

MALICIOUS

PDF

82.7 KB Created: 2021-03-24 22:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8943339bd07f4659084051a905f94fd4 SHA-1: b50a9ea0c34340f89deca8bc89f789c9a4c4fa3b SHA-256: 72aefa4acbe74f98117cb87edc4b8293343ad29f068fdd12a8355cba0c8835fa
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/123?utm_term=android+mobile+10000+to+15000 PDF link annotation
    • http://1s.london/93823950152il4vn.pdfIn PDF document text
    • http://storeplus.pro/3981240619540o1t.pdfIn PDF document text
    • http://academic-club.ru/beats_solo_3_headphones_bluetooth_not_working597iy.pdfIn PDF document text
    • http://streamsweets.com/big_bang_song_lyrics_in_englishtwfuq.pdfIn PDF document text
    • http://ilkertr.shop/wuwibexaraw2g13d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa4a64a1-c69a-4176-9ab9-82648dcabbba.filesusr.com/ugd/70701b_430d8e856ee145708d254718b27c1884.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_038b0416b7d04b7db53761ef738d681e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b9bb5a-863b-466c-b504-6fd2e1b9641d/dbt_skills_training_manual_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e194ad-61a0-4755-9865-1d2a803b25b7/57634457407.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_67024ac2f06b41e5a6768aea405ac881.pdf?index=trueIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_fae9aeb34cd84a6dab368a3452d61e60.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_6c9675074c4c4a398945281a2d769c74.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_a8dfcaa909074710b6310b6d4f0e9532.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_996c4afc7e854c4295d2d77e4c0df1ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/522be7be-1e2d-4c31-a630-8a0c94ab54c2/69758131472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b5ba1d-4a5c-4977-9705-babcaad4c638/kesetaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72aa8ba6-6a3d-4fe1-9cf6-8534b6c39a07/sipaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f410a4-fe1f-4ff4-85bb-f05a39ff4805/85009367897.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_4c825747d7564f3bb3d1d16836d71504.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/349e97fc-db8f-4884-b662-d70024a530e7/vokebukepakemom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c829eb8b-9a6f-496c-9dbd-ae93c60b555f/4232062539.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_02702bd7a79d47c5a84f91f3006492e8.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_ac9b8c913c5244b2b0d17ebe58249ec2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 5032 bytes
SHA-256: 147c74ec5b54a31575a0428b0d07df31e4a3e149c5376f3cc3419f9a8b1f2e21
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 10924 bytes
SHA-256: bc66debdcc614de98451d77394a61354d10bd0beecb378b3a9aa1ea34600743f
font_02_sfnt_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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