Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cd4886ac17463d…

MALICIOUS

PDF

82.5 KB Created: 2021-03-20 13:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4b72463ef4d181771aee57e7ce8dcf1 SHA-1: 257c998d5ad375a8af0c4c2598f6e109a330c4c5 SHA-256: b9cd4886ac17463dcfa5c3f3d774fc5a58463d1b8c1ef6aa6ecac3cf514dd02f
164 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically identified as a 'PDF_URI' pointing to 'https://dafemum.ru/wix?keyword=contract+signature+page+template+word', suggesting a phishing or malware distribution lure. The presence of a 'SE_INVOICE_LURE' heuristic further supports the idea that the document is designed to trick the user into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dafemum.ru/wix?keyword=contract+signature+page+template+word
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/mukivaviwuzeza.pdf
    • https://rajezedej.weebly.com/uploads/1/3/2/6/132682549/744184.pdf
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/10d69e.pdf
    • http://tiriruno.sportsontheweb.net/53649126643.pdf
    • https://cdn.sqhk.co/povewepalu/Gwpicjd/rs232_line_driver_ic.pdf
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/mewesojitoxirosinu.pdf
    • https://jagedebake.weebly.com/uploads/1/3/0/7/130738918/9a2e49.pdf
    • https://vesukinixemijuw.weebly.com/uploads/1/3/2/6/132696016/lulizozovavoranud.pdf
    • https://gisipunav.weebly.com/uploads/1/3/1/6/131636927/tufupegokopon.pdf
    • http://rosutob.getenjoyment.net/lord_of_the_flies_book_review_amazon.pdf
    • http://duzusedolatepe.mypressonline.com/chartered_financial_analyst_program_cfa_in_india.pdf
    • http://pelobana.66ghz.com/dasotozufawokamagusuvavog.pdf
    • https://tedenugimug.weebly.com/uploads/1/3/4/3/134345185/takogunasaxebovov.pdf
    • https://cdn.sqhk.co/xutujipux/gghhahb/5435286041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zorijefugixor.atwebpages.com/how_much_do_navy_submariners_get_paid.pdf
    • https://uploads.strikinglycdn.com/files/4b45960d-3b55-4aff-93f8-90f1e278752f/everything_wrong_with_american_education.pdf
    • https://uploads.strikinglycdn.com/files/32f0ff02-a3c7-457d-bf7b-42955ce4e9a1/public_administration_jobs_houston_texas.pdf
    • http://javewexo.epizy.com/believer_tamil_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/fe5422d4-45f5-42e2-9b8b-934c4b918afd/how_to_remove_honeywell_doorbell.pdf
    • http://berefokegiji.rf.gd/relative_clauses_worksheets_advanced.pdf
    • http://zivonupawidam.atwebpages.com/cfa_level_2_2020_curriculum.pdf
    • http://zelejiv.epizy.com/rental_agreement_format_in_tamil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c1.bin
8197ab055d4b4aa2d3b8a35b85522cd6d085ad4b5811fd648c1424732131f2ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 5388 bytes
font_01_sfnt_off00011707.bin
16d9a3f52f70e39073cf752af236d8b3a0df69a27ce9a176ff5b3c00f0d4601b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 10964 bytes

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