Malicious PDF — malware analysis report

Static analysis result for SHA-256 47dad5b4e77b3a97…

MALICIOUS

PDF

84.7 KB Created: 2021-04-03 00:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 673aed9b7877a0e3732459b2fef1882a SHA-1: 083ac6f024fe9c086c469f3b129b7a0f62348b57 SHA-256: 47dad5b4e77b3a977304d1dc1a828df3ef86c93b2f08dd85834da81d6d10f0cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a 'video player apk old version'. This, combined with heuristics indicating a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://jacksth.ru/123?utm_term=video+player+apk+old+version PDF link annotation
    • https://cdn.sqhk.co/lexijunibul/4Whikge/all_video_player_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/cMie05G/fofudizuwibopozezebo.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/healthrider_treadmill_manual.pdfIn PDF document text
    • http://gazajujana.mygamesonline.org/meaning_of_business_environment.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/dhiXb95/nachiketa_story_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/rugijij/69870015438.pdfIn PDF document text
    • http://bureluvitef.22web.org/21815068297.pdfIn PDF document text
    • http://tuvugisuxizew.iblogger.org/wasivibikegajukabu.pdfIn PDF document text
    • http://bunagutafa.getenjoyment.net/48621465225.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://rogofideb.onlinewebshop.net/52819472987.pdfIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_756983bb09ef4dd0adacb6498fa61ffd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a48a23-f818-4dba-83c5-334f107003a3/3675782285.pdfIn PDF document text
    • http://bevavotubuzepu.rf.gd/temilodusona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbbe4161-dd20-4000-8670-6793c3cc22a7/wajowemujasefonuk.pdfIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_d406db72ab0d43bdbde986e76c239363.pdf?index=trueIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/melexarerimefan.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_4c41183a40634f468a29ab2d870e854d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3f5982-716b-4321-a3bc-543d8df607bd/dopikimotepagez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8106297b-ebb3-4bcc-890c-434c508626d8/sirere.pdfIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_c473c0335081424383a8a1b753256dfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27c4a59-c65e-47b5-a2ff-5c7259082527/85468333738.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/20131200507.pdfIn PDF document text
    • http://nivitigu.epizy.com/algebra_1_regents_answers_june_2016.pdfIn PDF document text
    • http://fewajun.epizy.com/30286891279.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_da65863b637541209a7e7e4fe45a9cea.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 4852 bytes
SHA-256: c6bb361e071b44da2271b0b71ec0761e8f0770230b13b2cf33147cb0446dcf14
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 10920 bytes
SHA-256: 7aad785c9dbfb6fdd7a28e358567f0a7278dbcc51880135fc02726d14aac43b6
font_02_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_03_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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