Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6bfbd03c39972c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-25 06:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3b6ef284f1ac9a3b1bcaedfb9debcdce SHA-1: a6cfde85fe4588117c87a86c56a9c345c924b8d5 SHA-256: ca6bfbd03c39972ce37347202cc17dba04ece4d274e16c826e76f2270f44d67b
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/wix?keyword=anatomy+of+hand PDF link annotation
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/5768540.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/758466.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/twilight_saga_books_used.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/assumptions_of_ordinal_utility_theory.pdfIn PDF document text
    • http://gazajujana.mygamesonline.org/difference_between_monocot_and_dicot_plants.pdfIn PDF document text
    • http://soxetav.iblogger.org/kirobi.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/bitcoin_miner_software.pdfIn PDF document text
    • https://sevafunen.weebly.com/uploads/1/3/4/5/134588772/gawana.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/lipoxiv_pupevagojoxokut_gopimowa_xotix.pdfIn PDF document text
    • http://gopudumimipabol.mypressonline.com/libro_administracion_de_recursos_humanos_mondy.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/84094235818.pdfIn PDF document text
    • https://xizimojagetotom.weebly.com/uploads/1/3/3/9/133997363/6660055.pdfIn PDF document text
    • http://rovovijezigapo.22web.org/amazon_echo_show_2nd_generation_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_7acee24c22994293bb920778b25e4de9.pdf?index=trueIn PDF document text
    • http://sefatefa.epizy.com/physics_circuit_symbols.pdfIn PDF document text
    • http://zujejuxuj.rf.gd/xejufisenekizawetugu.pdfIn PDF document text
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_842bd84333fa44c59d055622505205e0.pdf?index=trueIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/lukas_graham_7_years_old_song_lyrics.pdfIn PDF document text
    • http://vulekagezefodek.rf.gd/giant_steps_clarinet_sheet_music.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_d8b56ed5d02b4c7bbb4840b362be221d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 4932 bytes
SHA-256: 356ced6b546099ddb3533d1e797620cf8815f1048d479281bc9f27b13c74cfa4
font_01_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 10532 bytes
SHA-256: 190447753dc9782f30e1016806b33a25eeb63a587de1f8d2043ed0f1216098d3

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