Malicious PDF — malware analysis report

Static analysis result for SHA-256 385bb5ff8702c1a5…

MALICIOUS

PDF

92.6 KB Created: 2021-04-07 20:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 024d77789a17e0887675353b5d2cf8a2 SHA-1: c29ab0434ae2131e27fe77df91fac8e049e956ff SHA-256: 385bb5ff8702c1a54bd7babe2d30f0d1e1836a1e4c5360eb7c3f94b927fde03e
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains an external URI and an SEO redirector link pointing to a suspicious domain, likely intended to lure users into downloading further malicious content. No scripts were extracted, but the PDF structure and heuristics suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=the+red+book+jung+barnes+and+noble PDF link annotation
    • http://ideal-it.fun/54575386091ii1h0.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/circular_motion_worksheet_answer_key.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/wawedezefibakeloj.pdfIn PDF document text
    • http://begdas.fun/issa_fitness_the_complete_guide_edit2vhi2.pdfIn PDF document text
    • https://megularebenava.weebly.com/uploads/1/3/1/1/131164421/e2b5fbfe70d8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_6002c1c72f1a5.pdfIn PDF document text
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/rixado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fe226e5c573b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_601fdeb192a88.pdfIn PDF document text
    • http://waliwosodumobu.iblogger.org/nexizivazix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_602dcd8d16475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_601040eec9abf.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/acta_constitutiva_de_una_sociedad_anonima_formato.pdfIn PDF document text
    • http://momentikshop.space/paligibif831dy.pdfIn PDF document text
    • http://sedouche.xyz/wosapuvu3azsv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/leganup.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/swann_security_camera_wiring_color_code.pdfIn PDF document text
    • http://bukezodebas.onlinewebshop.net/xuremiru.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/cctalk_protocol.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/cbse_answer_sheet_front_page_format.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/bsc_1st_year_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/dibijesobilopijexebilu.pdfIn PDF document text
    • http://bexopikirekide.rf.gd/adjetivos_posesivos_en_ingles_ejercicios.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 5316 bytes
SHA-256: bc093c11f39d602b214f2acf7f604fc808bf4ce9cc08922303823c36fe8f0774
font_01_sfnt_off00012966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12966 11560 bytes
SHA-256: b9bc975dd2b251a974d97a3f54fd9497f49e3ef22830a9a4842a8059687afe5a
font_02_sfnt_off00014fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA0 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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