Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa3e11d2e0eeb14…

MALICIOUS

PDF

75.4 KB Created: 2021-03-21 07:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 43745aef4a866f014f1cf2f91d50c4bb SHA-1: cfcc556a7a04984acb9414bdce39e5b7cc33d80e SHA-256: 7aa3e11d2e0eeb1450c4d9ca98b04c4e37cf2779559a4916d2ecfd81e5e403da
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or content-distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on potentially untrusted domains.

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://botokaw.ru/123?utm_term=pdf+files++sites PDF link annotation
    • http://dozetekotod.22web.org/wordly_wise_book_4_lesson_6.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/galek-wisag-mibasifukave.pdfIn PDF document text
    • http://lamorebeduzakoj.22web.org/atonia_uterina_tratamento.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5ff6909de1e57.pdfIn PDF document text
    • https://pivamuwonojazop.weebly.com/uploads/1/3/0/9/130969183/870629.pdfIn PDF document text
    • https://zirodamabesad.weebly.com/uploads/1/3/0/7/130740068/05eda87.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/8490870.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485301/normal_60054219abe47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_604daf07b7d11.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/xeruxaxer/ios_12._1._2_iphone_6_plus.pdfIn PDF document text
    • http://mujasanowagug.epizy.com/dead_poets_society_movie_yify.pdfIn PDF document text
    • http://tededuliwe.rf.gd/ultraman_geed_all_form.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/78278998201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d83c7f-dcc4-4f9e-80d8-9c3b28907b12/49282974469.pdfIn PDF document text
    • http://vezubigaru.rf.gd/vezanorisaximinomer.pdfIn PDF document text
    • http://tinozireru.epizy.com/mefomob.pdfIn PDF document text
    • http://pisasegobure.epizy.com/will_grayson_will_grayson_age_rating.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/formal_dress_alteration_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8609dc-f96b-4da9-bd25-1764d004ca11/bosch_dishwasher_installation_brackets.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/ilearning_oracle_answers_section_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9ced1b-8590-4c7d-a83c-bb91f77b152b/gone_with_the_wind_book_better_than_movie.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_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 4596 bytes
SHA-256: ea535bdd580e9a93c5c2a4b6dfea435ca1802f150beaa1064f28ff2d1c2dcd09
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 10680 bytes
SHA-256: 0f3008f6ae8e2474ebfe9b6531145cd199b9fbb0839d7076df52084f0645af12

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