Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe3d21a8b95693e…

MALICIOUS

PDF

71.9 KB Created: 2021-04-06 21:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2577d50489013579e504959a32c6e9a0 SHA-1: 1255bac16819e61b5fe070f1a8e36ec7d1198d28 SHA-256: 7fe3d21a8b95693e3344d22aef09da8616f03f5ffe0bb3b400908c83e328b042
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=carnivores+dinosaur+hunter+hd+mod+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457298/normal_5fe1602d3e857.pdfIn PDF document text
    • http://betixisu.22web.org/bobumisewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_6026e947cc6fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_602ed4a2ec043.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/80508654090.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/19981567531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462351/normal_5fd7b19a095e5.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/jizopavoki.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/43973301281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_603b6abc6a644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_603d7d2e1b3ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_5fd09fae6a7ab.pdfIn PDF document text
    • http://fagogit.sportsontheweb.net/combiner_deux_en_un_seul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7418d061-7675-4c62-841c-0bd8e3c45141/what_is_the_concept_of_co-creation.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/92415862748.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/gospel_of_mark_study_guide_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/90224889306.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/jizogusige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f7fa6c-9a3a-4fea-b2d1-12f1cb3056c4/89214178423.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/kopekokowakubozup.pdfIn PDF document text
    • http://vumopigaw.epizy.com/how_do_i_use_my_passport_ultra_for_mac.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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 5196 bytes
SHA-256: 47492d6b7b59cbb1a54f46a84d5639cf7d3eb17b64a265c82067dc2fb4cb6af4
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 10784 bytes
SHA-256: c9633b07193521fd653be99c2fbbc64dc3254f4465db00bcc53fae1352089169

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