Malicious PDF — malware analysis report

Static analysis result for SHA-256 827d49de6ffd1a25…

MALICIOUS

PDF

69.8 KB Created: 2021-02-11 10:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 42f076e0bf43f5baf6f901344d94aca7 SHA-1: 37c7b7eb7e307e05d8e5bd04231ff6cf741454f3 SHA-256: 827d49de6ffd1a2501babe04faeb6d3a3f07a88a0788e0112955d00672a1f1bc
184 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains multiple embedded URLs pointing to potentially malicious redirector infrastructure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic specifically flags a URL leading to 'yafferge.ru', indicating a likely phishing or malware distribution attempt. The presence of numerous links on disposable hosting further supports this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=incremental+sheet+forming+chair In PDF document text
    • http://reduslimitaly-official.website/40084081760i00le.pdfIn PDF document text
    • http://pusosokus.iblogger.org/ternary_ionic_compounds_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/FYjatgi/94940665995.pdfIn PDF document text
    • http://help-copyrightservice.xyz/ielts_reading_passage_great_migrations_answersxmj4q.pdfIn PDF document text
    • http://bezigex.iblogger.org/fortune_rocks_surf_report.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/hhiiggd/usa_network_roku_app_not_working.pdfIn PDF document text
    • http://chatik85939775.fun/pitch_black_afro_songsqvr82.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/eCLY9rU/you_say_hi_in_japanese.pdfIn PDF document text
    • http://wersita.fun/savage_worlds_feuille_de_personnageikv6m.pdfIn PDF document text
    • http://lujuvudav.22web.org/zisunutosuzanodopaso.pdfIn PDF document text
    • http://wersita.space/1121218575499tgd.pdfIn PDF document text
    • http://brettlockhart.com/jisatuwenabiwaduxb06sm.pdfIn PDF document text
    • http://svoytrylend.xyz/17931671923l8wal.pdfIn PDF document text
    • http://ejqy.com/paruvoveuda9o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://difedomuki.epizy.com/93183962008.pdfIn PDF document text
    • http://girifatu.rf.gd/ralufufamafojemonawobami.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/bay_news_9_former_anchors.pdfIn PDF document text
    • http://sevezogare.rf.gd/cannot_bbc_iplayer_android.pdfIn PDF document text
    • http://pafovipazatuk.rf.gd/76628591456.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 5232 bytes
SHA-256: 6f5bc6cbd8abeeae92f9b000d0095ccf1f44d4a8ad7f4023da87f51109b17483
font_01_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 11036 bytes
SHA-256: 078ecdf224aaa127bedb524396e6d49e6b4ffd44d4a6008d30c79529c5e60be9

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