Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc3f8bdefb1b44a…

MALICIOUS

PDF

75.7 KB Created: 2021-03-23 05:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bb7175eb39f523ae455344f86ab2b09a SHA-1: ea625b9eb715ad4bca1d29b7a9df8771b9b90ef0 SHA-256: 7dc3f8bdefb1b44a3aa25a41dc051afffcfbf09311976c485479b20427e8df8d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and link farms, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to search queries, reinforcing the lure aspect.

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
  • 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://botokaw.ru/wix?keyword=2000+isuzu+rodeo+repair+manual+pdf PDF link annotation
    • http://itawegan.space/20989965426op8lz.pdfIn PDF document text
    • http://christmas-gift.ru/acute_sinusitis_top_guidelinesfr1v0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_602585b883e41.pdfIn PDF document text
    • http://betmoy54.com/bedepuclath.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/367986398.pdfIn PDF document text
    • http://circulyarkadigital.xyz/how_to_eat_gluten_dairy_and_egg_freeyiwsv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_6025e56aaa722.pdfIn PDF document text
    • http://graatorama.space/toben24247.pdfIn PDF document text
    • http://funusiwevig.22web.org/manager_accounting_software_guide.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/romeo_juliet_telugu_movie_songs_download.pdfIn PDF document text
    • http://nunokulivot.22web.org/35830003423.pdfIn PDF document text
    • http://pannochki-art.com/cisco_router_e4200_firmware_download6wr39.pdfIn PDF document text
    • http://kemesigejafine.iblogger.org/beeline_uz_ilovasi_apk.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/adobe_scanner_free_download.pdfIn PDF document text
    • http://adminhalil.com/simile_o_pagtutulad_worksheet_for_grade_3h5b0y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_e207cb3f37224c67a61566807a7ad12a.pdf?index=trueIn PDF document text
    • http://jipudovisubu.rf.gd/nevomoduzo.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_8f1e84d560bd4d62b753f7be228bec56.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_bfd8c0b758ec4d1d92e91f1a3b0628f6.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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 5416 bytes
SHA-256: ed42813a8dc090d360f968eb9f256c62480038836cc7640c976364ef9667b4a8
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 11112 bytes
SHA-256: 680195aa137fac6ce00f49329a9f0b658f75fd7d1ccd2b3fdcd793c090eb8cb3

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