Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4f5fb24f8f3af4…

MALICIOUS

PDF

82.3 KB Created: 2021-06-12 20:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 26613a01418572d31c7845cb93deaa99 SHA-1: 67fd92771d1809e927b433997560e8a71437e54a SHA-256: eb4f5fb24f8f3af41fb7951d0e9f0db62001120592699b00760204d7a0168266
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains a fake CAPTCHA lure, designed to trick users into interacting with embedded links. The document functions as a link farm, directing users to various external sites, one of which is a known malicious URL. The presence of numerous external links and the fake CAPTCHA strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://chcial.ru/pbw?utm_term=tak+zang+miss+call+bomber+apk PDF link annotation
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/vakanilebawukiw.pdfIn PDF document text
    • https://wifitesoxu.weebly.com/uploads/1/3/4/6/134631177/savubowamezoso-gabonu.pdfIn PDF document text
    • https://lisesadavageg.weebly.com/uploads/1/3/1/4/131438313/muxuxedakapojup-kurow-gujanur.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/6573214.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/dazilegodipu-puroresuveza-ludaxamesul.pdfIn PDF document text
    • https://pateliwo.weebly.com/uploads/1/3/5/3/135340743/muzufowot.pdfIn PDF document text
    • https://dovowufola.weebly.com/uploads/1/3/4/4/134438787/06c3e22c.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/5d7ee318.pdfIn PDF document text
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/demim.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://uploads.strikinglycdn.com/files/14f77e17-49cc-440f-86a2-90b057f2b285/55787679028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebd4597-42b2-4abf-8bb6-8da31c84cd3b/17136615261.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/w/file/fetch/144515382/88371865952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f4ed8e-226e-439e-a15d-c59bfa9987aa/65670058566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455a9d58-6f65-4472-9625-4c37e4313053/epic_battle_simulator_2_hack_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab7ee94a-cfc8-4883-a166-e26517cc9e6f/profesor_zellagro_horscopo_semanal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2611d9-c0e6-46c3-9ce6-7db58f94a6a1/sap_table_delivery_class_g.pdfIn PDF document text
    • http://guleribiko.pbworks.com/f/sony_icd-bx140_4gb_digital_voice_recorder_manual.pdfIn PDF document text
    • http://texuxokubu.pbworks.com/w/file/fetch/145179639/student_exploration_food_chain_gizmo_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257b158b-b2b8-4600-a167-20c0a2298266/harry_potter_book_set_in_hindi_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff457f70-c972-4987-b31a-a52d0c8762d9/lijisejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1481dde3-9c5f-4a22-969a-6bbc0564e4a3/kagax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74195b4d-1b67-4fae-ab47-c33a9af171ae/gunexegebapunopivoge.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 5164 bytes
SHA-256: bb94cfcd8891c6ab9b6e18280fecb34e3dc5560e3c885a1d2904b1b877ae78ac
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 2676 bytes
SHA-256: 43e152f1eee9d6a6349053ce3f7da1700ff8ef81db82627e51f2b7a1ed5855ce
font_02_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 11456 bytes
SHA-256: 33752dabd1f2d919c11c97e38923930f8d18efec0e86797594837bb8c6cf2914
font_03_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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