Malicious PDF — malware analysis report

Static analysis result for SHA-256 f632f5fc09d4ccd8…

MALICIOUS

PDF

83.1 KB Created: 2021-05-17 06:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ca2dc8f0d66cee0b78e37d62131c7718 SHA-1: 924ae0ade5a3da0475f731b0bc4214707fa820eb SHA-256: f632f5fc09d4ccd8a3e51650cee33abcab0df0fe51a1abe57f1baa676185b0c6
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 0.9998

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://golowaki.ru/strik?utm_term=yamaha+rxv373+arc PDF link annotation
    • http://feedbacrnz.space/eat_it_all_gifsvx8c.pdfIn PDF document text
    • http://qqkaxes.xyz/lepexozls73.pdfIn PDF document text
    • http://gufutaca3.xyz/jaxovavifepajogauj5.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/60864827881mblpv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5fdb9c23ec8b9.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/iije0AG/hot_wheels_id_cars_list_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_604ae9c2839b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kisoxukapab/jogf8hO/zain_pay_bill_kuwait.pdfIn PDF document text
    • http://alcexpress1.xyz/gun_strike_blood_shoot_game_downloadxwpgj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5fca4662257db.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/42649a0f-7dd0-440a-9499-be2f2ba5cef1/623945196.pdfIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_2368509ca10b43d1a933b8c420815d60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03f6243-a3ea-4139-aa8e-9caf26007bf3/tuziziruvefofulaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67375560-212b-4f9c-80d6-f38d3edb8347/56564987712.pdfIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_01823f7b291048b6814088ce130fce89.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_ab05ff319a9a40439ab78a901a5d5774.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_6e043b7d61df44bebd81249e4a923105.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_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 5160 bytes
SHA-256: dc675cb68a5596906b739250f248b9ce71bc6cd84b6c6fa988e547dccadcf8fb
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 11424 bytes
SHA-256: 5af7973816718258f0ac6fcf6c80b15923bf725443a3102639c15f8ad3d8e1d9
font_02_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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