Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c08c66ea5fab91f…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 03:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d6a0db48fb3f3ba2e54efef00cc55873 SHA-1: ebd35d39111dcc5f3b6c4cdcdfb8a5269065f453 SHA-256: 6c08c66ea5fab91f21d50787b08662c50a06404d5d50cba0c578db76a5c7205f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to reference a review book, likely a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://dugedepap.ru/strik?utm_term=barron%2527s+ccrn+review+book PDF link annotation
    • https://wewowaxidibu.weebly.com/uploads/1/3/2/3/132303239/4574858.pdfIn PDF document text
    • https://lagomumudalo.weebly.com/uploads/1/3/2/6/132681699/5966166.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/kjgia7f/77327394128.pdfIn PDF document text
    • https://mufanujirube.weebly.com/uploads/1/3/5/3/135348440/2b95dafd67.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/fjgdhbT/banner_saga_2_lundar_choices.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/aPftdje/49139289361.pdfIn PDF document text
    • https://vaxidavuk.weebly.com/uploads/1/3/4/3/134371973/jisarigoru.pdfIn PDF document text
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/7398528.pdfIn PDF document text
    • http://hangzhoumetal.ru/g_shock_5081_ga-100_manualete8g.pdfIn PDF document text
    • http://fallofelin.online/financial_accounting_libbyzetpb.pdfIn PDF document text
    • https://pipoweje.weebly.com/uploads/1/3/1/4/131438571/cd64e5ba90ce7d.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/hh5xtkp/photo_finish_horse_racing_hack_apk.pdfIn PDF document text
    • http://blockhcain.host/auld_lang_syne_lyrics_tagalog_versionbkqp3.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/eN1JxCI/mobiletrans_copy_data_to_android_apk.pdfIn PDF document text
    • https://xevivipemasap.weebly.com/uploads/1/3/4/4/134481894/nemera.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/jolugisid_wuveweduf_padamogas_zewukewubol.pdfIn PDF document text
    • http://jewlgems.com/sonoxepeguzuu23q8.pdfIn PDF document text
    • https://nuxikasupi.weebly.com/uploads/1/3/4/5/134528480/97d207790cc.pdfIn PDF document text
    • https://vukujaxirebes.weebly.com/uploads/1/3/4/1/134108713/rawajekux_dunigavakebor.pdfIn PDF document text
    • http://freshka.fun/sepelavbfc99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_50e430b0f5874b36abc5fa74cfa1d59b.pdf?index=trueIn PDF document text
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_7ba77d83cec2407bbdf08dacdb57b379.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_63a4389b2ca64c46b2d35e0d812f147f.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_8901ef0241bc400ca1eaee6f6e81f5a7.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 5200 bytes
SHA-256: 084a8bf1bc19e10a684e3a37657cad0cfd9d63ac3fdae76b82309f83204ec12b
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 10560 bytes
SHA-256: cb5bcdc5374e5d195dea14911266f9a236f09691747cd29ca74b77b29e4e147f
font_02_sfnt_off00010f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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