Malicious PDF — malware analysis report

Static analysis result for SHA-256 449f001f48de404e…

MALICIOUS

PDF

77.4 KB Created: 2021-06-02 05:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 818639eaa6a83f3b159f97d1f79b905a SHA-1: 5bb65ceb722fb25213dd1e117a1ab489f4dc6b97 SHA-256: 449f001f48de404ec6260941e5ac189249b945c9d32408c4c95cf82d383853d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search terms, further supporting a phishing or social engineering attack vector.

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://nipisod.ru/123?utm_term=baixa+idade+m%25C3%25A9dia+resumo+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425726/normal_5fcc9b82aa095.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5ff0a1be3590b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_602fcea489300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_604dc45c4f351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_6069754f24f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5fd7957e12309.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetibubib.pbworks.com/f/pokemon_light_platinum_gba_free_download_for_android.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/f/66724595874.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144488778/3d_printed_house_builders.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/w/file/fetch/144478473/monday_punday_199_answers_484.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144455082/trivia_crack_2_cheats.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144486969/kugedelupulixukajobomok.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144425679/firurugejalim.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144480966/fbulas_cortas_en_italiano.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/nekagavenaka.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144480654/4284991198.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144448257/do_god_answer_prayers_of_sinners.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/advantages_of_non_probability_sampling.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144427698/uc_browser_for_pc_windows_10_64_bit_free_download_softonic.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/john_deere_425_mower_deck_belt_diagram.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144485400/covid_cause_vertigo.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/duvatisunutedirigogina.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 5412 bytes
SHA-256: b45925d4fd0caba771f0d51501ed852f07383724291c3c2b73044d608a7425e6
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 12944 bytes
SHA-256: 91c8c47364046ceb00f78b49e94897905b0f215480f07d4e054e0a4ccef1762b

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