Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d248f00474768b…

MALICIOUS

PDF

84.0 KB Created: 2021-03-18 15:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: ce4b32009c4e16522b0f30bd3790a415 SHA-1: f8dce9bfe58a6150370d86eb5589057e3ffdc04f SHA-256: a1d248f00474768bfd98b88da62ff94d14ad9d82f7a814832b0d3a971b96aa78
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript, though not fully analyzed here, further supports the potential for malicious actions such as downloading secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=riley+inside+out+adopted PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479705/normal_601ab74442fb0.pdfIn PDF document text
    • http://nazhivy.net/tifuvegukiwifafejapuxb4532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_605093009f79a.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/america_the_story_of_us_episode_1_worksheet_answers.pdfIn PDF document text
    • http://woodlesenka.ru/342962607942ahoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fe5e201eda0f.pdfIn PDF document text
    • http://vinograd.io/what_are_the_36_questions_to_fall_in_loveg58zw.pdfIn PDF document text
    • http://predouche.xyz/amcor_portable_air_conditioner_kf9000e_pricegszi3.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/nosusabusanowuxanapij1bqu1.pdfIn PDF document text
    • http://yazansoft.com/66962723544crapy.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/the_moviegoer_walker_percy_amazon.pdfIn PDF document text
    • http://salestore.pro/jeladepikxjue.pdfIn PDF document text
    • http://kompledom.com/fda_approval_for_metformin_in_pregnancyg7l0s.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
    • http://fidalanono.myartsonline.com/xanozewol.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/zexojudanokenixabunifot.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/97267472705.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/warhammer_40k_drukhari_codex.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/pafexizan.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/wine_label_template_word_free.pdfIn PDF document text
    • http://rawegutidum.onlinewebshop.net/basic_english_comprehension_test_with_answers.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/68908424905.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 4848 bytes
SHA-256: 56ec140011717972b693193c50217e44bc6cc7ce68ca45c88306c8829aa0db3e
font_01_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 10900 bytes
SHA-256: 7b6342935ef0f6ef159aafa122b9d17b2271d29ce0400e35333f2aeb79d03b2d
font_02_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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