Malicious PDF — malware analysis report

Static analysis result for SHA-256 920bbcf95c2125e0…

MALICIOUS

PDF

71.2 KB Created: 2021-03-06 03:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 53ac7f6c14ffb1871602c73a279dea4f SHA-1: 4252546ceb1d5d7a4de878d0d4a92795473585d8 SHA-256: 920bbcf95c2125e085cd41bfb1b975aba6ac5c42849b2384d8928252b5ad7e8b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to a 'bank on it worksheet'. No scripts were extracted, but the high number of suspicious URLs suggests the primary attack vector is directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/wix?keyword=bank+on+it+worksheet PDF link annotation
    • http://makamar.xyz/what_do_i_do_with_form_ssa-1099bsl8i.pdfIn PDF document text
    • http://sethel.xyz/mivarusuzunonamarenklp0a.pdfIn PDF document text
    • http://sberhome.ru/nipopamixenifeperibenon9ljwk.pdfIn PDF document text
    • http://es50off.pro/how_to_factory_reset_a_nextbook_intel_insidez5quy.pdfIn PDF document text
    • http://websporizlehd.com/niravejsymy.pdfIn PDF document text
    • http://chatik85939775.fun/dd_5e_planescapemqbjt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_6021000db8f7a.pdfIn PDF document text
    • http://znatural.space/harry_potter_and_the_half_blood_prince_video_game_download9n5a5.pdfIn PDF document text
    • http://propovar.ru/javascript_tutorial_udemy_freeze4s4.pdfIn PDF document text
    • http://megantv.site/2766442095596m1j.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/jurassic_life_t_rex_simulator_mod_apk6l0ur.pdfIn PDF document text
    • http://temppicture.xyz/tunaxavajexe9e5hf.pdfIn PDF document text
    • http://matroskin.space/36220772779i2yp7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408460/normal_5ff8c8644196c.pdfIn PDF document text
    • http://henrysavbr.site/recipes_for_rockcrok_everyday_panrzdy5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_603f0171baad9.pdfIn PDF document text
    • http://afracheat1.xyz/how_to_get_rust_off_grill_gratesg9zzk.pdfIn PDF document text
    • http://kinokaiff.space/vector_robot_for_sale_canadark0v9.pdfIn PDF document text
    • http://urott-hu.com/fejagizebidemasnp0lz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_fbafda7764ac46b194333fac8bcf7cb5.pdf?index=trueIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_0d14d71f0a464daea2862a41295ed441.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_15105228348c4d7ab7d023a9d299633c.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_d9c67fe5780b43eb87a381b22aabadc1.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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 4948 bytes
SHA-256: 7ed688df01b7f5dce750f695e99915075e9cfb0b535b3a2ba09db3c4b5ea5f72
font_01_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 10300 bytes
SHA-256: 5ad42447aeb1b12bb4859f9cf72d5f53f2fecd9d9d461977f0e3fb647f34d332

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