Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e7e914c8c03034…

MALICIOUS

PDF

72.5 KB Created: 2021-02-06 01:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 91e7dd014be2062576788ac3201a1727 SHA-1: 53410d808bf2b344de9e36f695721667b5a24bd8 SHA-256: 24e7e914c8c0303457423ddb7bbaf47a1f216115fde3fb444d70dabe634ccf21
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 links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to external, potentially harmful, websites.

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://leonvi.ru/123?utm_term=mypsychlab+chapter+13+answers PDF link annotation
    • http://azakalaza3.xyz/szckte_anlam_konu_anlatimildqk0.pdfIn PDF document text
    • http://kelnoteres.xyz/polaris_trailblazer_250_service_manual59hfu.pdfIn PDF document text
    • http://passive-income.ru/masud_rana_bangla_book_downloadhmdbn.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/1781d5a376116f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5fd04658bc3af.pdfIn PDF document text
    • http://wordsidepost.top/brain_balance_reviews_tampalwlv3.pdfIn PDF document text
    • http://copyright-security-ig.com/xuravaxi6ez1r.pdfIn PDF document text
    • https://kogafisefog.weebly.com/uploads/1/3/1/4/131438876/sisofawagonalujil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_5fd657b8068e4.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/starbucks_drinks_without_coffee_in_itizmd7.pdfIn PDF document text
    • http://premiumpornclips.com/deadlight_trophy_guide_and_roadmapdmwo0.pdfIn PDF document text
    • http://vashobereg.com/vba_excel_bookeznrn.pdfIn PDF document text
    • https://timowerudep.weebly.com/uploads/1/3/0/7/130738780/pigovi.pdfIn PDF document text
    • https://xodimiteti.weebly.com/uploads/1/3/0/7/130776847/5554924.pdfIn PDF document text
    • https://lirisuvobuku.weebly.com/uploads/1/3/5/3/135399047/xepabavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5fe2ba96b2102.pdfIn PDF document text
    • http://13millions-warzone.store/yashoda_ka_nandlala_mp3_song_downloanmkc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wetevali/format_sd_card_corrupted.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/pugawifekinajezo.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/aace_hyperlipidemia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/5036022821.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 5208 bytes
SHA-256: a1436a9839250a416409b741fa366bcaff342ec8818c0f31aded0b572976611a
font_01_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 10632 bytes
SHA-256: 55cfafe656c97b51607196f535fed7560c00a771a8d0bd1510e61231546157ca
font_02_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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