Malicious PDF — malware analysis report

Static analysis result for SHA-256 022b631972be543d…

MALICIOUS

PDF

74.6 KB Created: 2021-03-16 09:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9873ffe5cebcd57df31080f6c03e5f92 SHA-1: d6cc7e28ce372450b16ede88ba955c3b5e035656 SHA-256: 022b631972be543deb11740533367170cb231423d5be6830abfb72071ba641f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to investment PDFs, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/wix?keyword=name+that+investment+pdf+answers PDF link annotation
    • http://josogub.iblogger.org/vodaba.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/gigh0hg/all_creatures_great_and_small_book_age_appropriate.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/aThF4jc/download_sub4sub_pro_for_youtube_mod_apk.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/762f76746d7984e.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/D4jhhgT/two_dots_key_locations_gift_workshop.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/hdMPjfq/tosafezezibiloxed.pdfIn PDF document text
    • http://selectgetc.top/atp_adp_energy_cycle_answer_key4hdbv.pdfIn PDF document text
    • http://complect-tech.ru/brobar_boli_video_mr_jattde2ve.pdfIn PDF document text
    • http://reabook.online/xanopizatimjkq0s.pdfIn PDF document text
    • http://kujazudoxiro.22web.org/answer_to_the_impossible_quiz_level_34.pdfIn PDF document text
    • https://petovowatudero.weebly.com/uploads/1/3/1/6/131606592/juxop-wakinewavafuvos-meregawipofuw-kofudozijejatam.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/fhdDOh1/dandara_trials_of_fear_apk_1._3._51.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/ba02437b-e586-4313-8ff9-30610f5aca3d/lagerevowofemin.pdfIn PDF document text
    • http://junakaz.epizy.com/cassandra_tutorial_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6b0607-fd9b-4fed-8943-c75f33948104/13722338359.pdfIn PDF document text
    • http://tosodesuvivat.epizy.com/pulavuzofaluduni.pdfIn PDF document text
    • http://zelanokavekav.rf.gd/votoxupemumilupadejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e28b10c-46d0-480c-8d88-0b621d11ed53/laratakupuwe.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_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 5372 bytes
SHA-256: f9496c2d84fe096b80d1f5833fdb2d6409654aabbe9b771ee4af57352a2c628b
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 11256 bytes
SHA-256: 0a647f6584a774a77e3ddfa7608da731b7f1d47bc9119ab69d40352956f10612

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