Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f5c2174e99c6ef…

MALICIOUS

PDF

78.3 KB Created: 2021-02-25 12:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4650ffc5128487aaec062ebfb60a4c5d SHA-1: 92ecfeb50fbaca6a44529c0a6fa4ce9cdfd38cee SHA-256: a3f5c2174e99c6ef7e308152b8dab77c5bbc3b627454e093cd8dd0ff9acb03fe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a diet book, directing users to external sites. The presence of many disposable domains and link farm characteristics suggests a campaign focused on distributing further malicious content or phishing.

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://seumenha.ru/wix?keyword=the+every+other+day+diet+by+dr.+krista+varady+pdf PDF link annotation
    • http://itanto.space/aircheck_g2_user_manuallq1ra.pdfIn PDF document text
    • http://formblckr1.xyz/bosch_double_oven_manualb9yap.pdfIn PDF document text
    • http://site-shop.xyz/40003788147kuylp.pdfIn PDF document text
    • http://reassurez-moi-fr.info/toxegaxasoeo548.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/internal_audit_jobs_in_south_africa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488349/normal_600701417f6f7.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/the_peasants_life_during_the_middle_ages_was_largely_determined_by.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/how_to_fix_a_small_engine_oil_leak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_6015ce6abc8f4.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/rituals_of_memory.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/what_is_a_trustee_job_in_the_church.pdfIn PDF document text
    • http://meblik.su/addis_ababa_condominium_40_60_winners_2019fqi9s.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/taco_bell_crunchy_taco_nutrition_info.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_601ad1b5b751f.pdfIn PDF document text
    • http://fbcopyright-center.com/79319602534uoead.pdfIn PDF document text
    • http://organicnu.info/3859894918ic0vk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajulugebimisu.myartsonline.com/75644836396.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/komatozaluriperarojalam.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/7366906975.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_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 5444 bytes
SHA-256: 83afe6045a16da5aaa713fdf0356f411a45f85d7be89ea444c8be697480816e9
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 11316 bytes
SHA-256: 492e7e453e4ed80ca20f4c18cf2592aac7b5bb9bde0f54b2f51fe60fe5fc83c2

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