Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d740a121635770e…

MALICIOUS

PDF

92.8 KB Created: 2021-03-01 00:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 12b8850fd57e0c817ba5440e01442b74 SHA-1: 4e4c431b609b387884db404639bf8e6e078d2a95 SHA-256: 6d740a121635770e8d0851dfab3f2b53d4273c07ae2cdfaac64cadea85fb1e35
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'Brandenburg concerto no 2 analysis', intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wb?keyword=brandenburg%20concerto%20no%202%20analysis PDF link annotation
    • http://sanatoriy-izumrudny.ru/35215032040gprko.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/human_resource_management_gary_dessler_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/7dgdOgd/pac_man_ghost_outfit.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/ia6RvZc/photo_video_maker_online_free.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/renefifisat.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/g7F44ge/25563943194.pdfIn PDF document text
    • https://rowevopa.weebly.com/uploads/1/3/1/8/131872281/099e217f1.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/soratejugubes_gofudatibefug_rasiposajelamer.pdfIn PDF document text
    • http://detonicro.website/maven_3.0_5_downloadae0yx.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/what_is_the_meaning_of_araby_in_bengali.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/56492225263.pdfIn PDF document text
    • http://fortuneo-enligne.com/zusegjjc3w.pdfIn PDF document text
    • https://cdn.sqhk.co/migawudewiw/s9iimqm/75498714181.pdfIn PDF document text
    • http://detonic-italia.website/brown_vs_board_of_education_of_topeka_kansas_significancelj3j0.pdfIn PDF document text
    • http://shtangye.xyz/convert_unit_rates_worksheet_7th_gradeu1iqz.pdfIn PDF document text
    • http://erogan24.website/12th_street_rag_guitarrgflw.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/casio_f-91w_alarm_off.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nizowozutagele.atwebpages.com/59430225241.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 5532 bytes
SHA-256: 67475f4472639f2295b8ee1c46c0bc526a01d4c39ca0882ffde96300aa5e0bfd
font_01_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000128b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B8 11540 bytes
SHA-256: c7cffc5b5f88e68a0a54aa4a2f31bf4ad8deef9e9a79a41dc7079e9395f8e23f
font_03_sfnt_off00014eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB6 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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