Malicious PDF — malware analysis report

Static analysis result for SHA-256 f795b97e7152ad7b…

MALICIOUS

PDF

82.6 KB Created: 2021-02-27 18:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c3befc4ed0292f8490f37b674ffc6825 SHA-1: c4d9517edf3838b0d262661d24a6f50b91bf7a8e SHA-256: f795b97e7152ad7bbd99dc7313723f3e7a96f650185a510fefafcca446c0f007
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a high-priority heuristic indicating an image lure linked to an SEO redirector. The primary IOC is the redirector URL, which likely leads to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=what+is+a+synonym+for+electric+potential PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415326/normal_60382fc87bdfe.pdfIn PDF document text
    • https://cdn.sqhk.co/doxelatofon/jfgiSrA/4th_grade_learning_games_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gulaxemetila/djdjb3v/lowebakusigavuwow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_60374019c462e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379613/normal_5fec7894d3b2b.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/NwiyjdI/glacier_national_park_guided_hikes.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/igyidjj/boledezisenipew.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/fKghvhh/arizona_blm_shooting_map.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://s3.amazonaws.com/dekogamik/rufepemakilomefaporaf.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/sunazepesoga.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/25535027918.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/mu_cv_ting_anh_chuyn_nghip.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 5160 bytes
SHA-256: 08847b3f342a11dfd5672ac827602eb3b19667f652010da6102208e7e6ace199
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10424 bytes
SHA-256: 9c1a7c23ad8126120fb741600ccbd4af119b033fe220daee287f2cb987745ce2
font_02_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 16084 bytes
SHA-256: 492b72e9e8f0bcef963ad10e88f80b5598216a8c56d4f3a27963a6a5716a4957
font_03_sfnt_off00012f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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