Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f4e79428282e6d…

MALICIOUS

PDF

139.6 KB Created: 2021-04-23 17:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d9a4270b4c6b5defea77b117ab07a9e SHA-1: 2e7ca223c854b09be9d0e70b141470fa0da2a980 SHA-256: c2f4e79428282e6d6e705751b82459dbe13a2a5809f6dbe2a725187785db3633
186 Risk Score

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 0.9962

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://jacksth.ru/strik?utm_term=d%2526d+character+quiz PDF link annotation
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/sevoretaburekobetamu.pdfIn PDF document text
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/pavubo-zenusujajepezuj-nizomaxe.pdfIn PDF document text
    • https://pilologalegalek.weebly.com/uploads/1/3/0/7/130740349/089ed4ece504c68.pdfIn PDF document text
    • https://radiduma.weebly.com/uploads/1/3/4/3/134362755/vagisipagujilof_lixibobiromef_gevim_botitugokafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_349a784390ea4a20b42fec63797056e9.pdf?index=trueIn PDF document text
    • http://mudiwufanag.epizy.com/logoretufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46ebc87-7982-47f9-a18f-2711dc5dc0a0/paintball_store_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a58a999-a2ce-486b-b850-d360f47bdfae/how_to_start_a_wordpress.org_site.pdfIn PDF document text
    • http://tanoxoxafobin.epizy.com/case_study_sample.pdfIn PDF document text
    • http://fizenigapajawak.epizy.com/mariage_d_amour_clayderman.pdfIn PDF document text
    • http://moxirekix.epizy.com/witikusozijugotenonalar.pdfIn PDF document text
    • http://rudemunipa.epizy.com/video_alfina_nindiyani_busyrolana.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/10648259260.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_2d14f4d4c0344f58afa995e3e328011c.pdf?index=trueIn PDF document text
    • http://bosirizowu.rf.gd/57308109476.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/computer_systems_technology_-_networking_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c990e8c1-d4c9-4e51-99a1-55494d7e270f/jifira.pdfIn PDF document text
    • http://xuvunemomot.epizy.com/68706696737.pdfIn PDF document text
    • http://tapepoxawire.epizy.com/guidewire_testing_jobs_in_germany.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_6b52dec6c3eb45dc9c760a1b7f309226.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_1df5a49c69b346208fd92e6ebcd679fd.pdf?index=trueIn PDF document text
    • http://nozaleb.rf.gd/zodureditekob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f869df-a199-4c88-9c36-8b7d7b36c2fa/tascam_424_mk3_manual.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
    • 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_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 70176 bytes
SHA-256: 02a6e384f33e0283516c48caf6b37ce108492160d169b86ebd8056a1b04c19a1
font_01_sfnt_off0001d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D547 4156 bytes
SHA-256: 9253c4ec90eb8b217ae91b3aef6412788d3d1419415539c5cfb70110cf842fd1
font_02_sfnt_off0001e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E375 11244 bytes
SHA-256: dcf34e2d5b85583b9bf96672df300d5433f8fdfd721906b6f677d9e6b4847721
font_03_sfnt_off000208e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208E1 16396 bytes
SHA-256: 51b524decd76546fa2f56d885fa808af858f72c647caf08d076e4ef333600f9d