Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03abc98730172a5…

MALICIOUS

PDF

76.9 KB Created: 2021-03-24 13:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 623b1322d15fe49319237914f426e374 SHA-1: 6eb162123befdcce5f4dba51ad167aa8d30e8ab0 SHA-256: a03abc98730172a568532b1b57489b3ff41b8ac4caafe35c452e208675db3fee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL is highlighted as a potential lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan. The document body, though heavily obfuscated, contains text related to a 'parts manual', suggesting a social engineering pretext.

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://ponafet.ru/123?utm_term=campagna+t+rex+parts+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412378/normal_6011d33ccee47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_6007d60f44428.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471514/normal_5ff7f6160a551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_6011ef5280590.pdfIn PDF document text
    • http://greenbike.shop/jenedemarakepek01p63.pdfIn PDF document text
    • http://instasurprise.online/what_is_a_descriptive_research_design9ho09.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/lower_back_strengthening_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500878/normal_5fe0edc81ad18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_601567aa3e214.pdfIn PDF document text
    • http://silkhfig.bid/adobe_premiere_pro_tutorial_20190wk04.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/pijutalinawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477877/normal_5ff5f0711cab5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_881cc8f60faf44d3823b2e3396bebd46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98158b89-2606-4546-ade3-d7a369e5fd89/2014_street_glide_25000_mile_service.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_12f992d6f2f04f1fbeb4edf140f1b437.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e830ce-bc93-44d4-81f3-7991848b7a45/is_black_and_decker_a_good_brand_for_appliances.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350a416d-8315-4a26-b722-a539d4f48e33/best_book_to_learn_final_cut_pro_x.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/dimoval.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 5112 bytes
SHA-256: 2aba301a5d2a41ae5bf85f97304fad837dc77f752fa3726188d1ec27610d02d1
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 10004 bytes
SHA-256: 47688c3b377edc1de57fc4c08716b49cc56985a53f8b0ac31f9275196b8b595e
font_02_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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