Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f279dae14085d12…

MALICIOUS

PDF

77.7 KB Created: 2021-04-17 16:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: af598a0e95e8eb5a352572f5a2f40444 SHA-1: 10e751da4b520791f1d89dee360ba4e67d3b9e0c SHA-256: 4f279dae14085d127d9e24e1e426f02b9904c058d26acc8816252d671284a498
126 Risk Score

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 0.9997

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://crophysi.ru/strik?utm_term=eton+scorpion+crank+solar+radio PDF link annotation
    • https://cdn.sqhk.co/nexetifosam/gc43Evf/ninjago_movie_cole.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/jhejbja/77363233416.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/Phhhhii/piwema.pdfIn PDF document text
    • http://msertis.xyz/lg_dual_inverter_error_code_ch_101gh5j.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/0he3PvI/do_we_change_clock_tonight.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/speed_of_trust_training.pdfIn PDF document text
    • http://creditreportus.info/80521234032yidw.pdfIn PDF document text
    • http://rodisawikikofu.medianewsonline.com/fasuvaz.pdfIn PDF document text
    • http://thecet.xyz/takidekuponoxitosin0amzf.pdfIn PDF document text
    • http://raifaisentgo.online/hrbp_interview_questions_and_answersx242q.pdfIn PDF document text
    • http://voirlo.xyz/how_much_is_the_2020_mustangbel56.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://xugonowelimije.epizy.com/litebop.pdfIn PDF document text
    • http://bipibalixezesat.epizy.com/30896040153.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/christmas_bingo_free_printable.pdfIn PDF document text
    • http://bomapogixojepo.epizy.com/wumig.pdfIn PDF document text
    • http://tajuvajewebu.epizy.com/kokomow.pdfIn PDF document text
    • http://nemebikox.epizy.com/animals_maroon_5_lyrics.pdfIn PDF document text
    • http://nezatexefig.epizy.com/business_books_to_read_in_2020.pdfIn PDF document text
    • http://pesokijodaroxo.epizy.com/brand_identity_example.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 4756 bytes
SHA-256: 8c9de4d6f46b607f488e451dde31ea1edf5aa317dd79d9fb7a297e6138750416
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 11060 bytes
SHA-256: 684b74d08cf2cf11185a87635a60ce2818b081edb92908ea9801fe94b90768af
font_02_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e