Malicious PDF — malware analysis report

Static analysis result for SHA-256 2438488f554141f6…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 05:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 110b848def1d57f96fb17ae6aecaae6a SHA-1: 0ded6e9760abbca7048d99dcde7c06cb208baba8 SHA-256: 2438488f554141f695104ccea60b70ad5d483152f44fa9d25cae943b91f2edae
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a mass of external links, many of which are SEO-optimized and redirect through a link farm, suggesting an attempt to distribute malicious content or phish for information. The primary redirector URL is https://nipisod.ru/strik?utm_term=world+map+country+names+pdf, which is used as a lure for free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://nipisod.ru/strik?utm_term=world+map+country+names+pdf PDF link annotation
    • https://kawapojironene.weebly.com/uploads/1/3/1/6/131637385/laxamuveki.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/jcJThh6/black_friday_deals_2019_best_buy_apple_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/12RDQZF/wizard_of_oz_quotes_heart.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/iqjekji/mineral_fusion_nail_polish_reviews.pdfIn PDF document text
    • https://refotazobig.weebly.com/uploads/1/3/0/9/130969241/25cb10a81d1.pdfIn PDF document text
    • https://wawurekufa.weebly.com/uploads/1/3/4/3/134322490/e09b05bc86.pdfIn PDF document text
    • https://rodokonodak.weebly.com/uploads/1/3/4/7/134730192/dadufumusiwemip-porasovidaj-binivefugunor-kisizadepuj.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/XdihSpu/android_9_versus_8.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/6hf0hxc/cariloha_sheets_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/ggjhcAg/48728282540.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/eXhdKjh/events_at_the_factory_in_franklin_tennessee.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/JxwjiXw/custom_motorcycle_helmets_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/Goghmxy/caravan_war_heroes_and_tower_defense_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/gcrf7id/dixokokubasutenuxubibuk.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/fhdEhcW/badlands_movie_2019_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/chggjh4/jeradinadarutewered.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/lorifumofelu/char_broil_performance_vs_signature_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241935f6-2d86-4411-88b2-4decb6b91fe9/shark_navigator_lift_away_cleaning_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/1995_jeep_wrangler_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc1ef95-7457-4aba-9c27-75383cb24220/formato_hoja_de_vida_en_word_para_llenar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6ed030-b62c-470d-bbc2-623246c2c7b9/dugowibakiromir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcee25bc-6457-4844-9aa7-2db4c925eb14/nagiwela.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_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 5416 bytes
SHA-256: 7a6bdd5c9697fb05dc50057fe9ac6b312d6c9fb58fa760905eeac4be0e6ba002
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 11388 bytes
SHA-256: c449516dc8be464e7fb6a9e69c4c1729030a73d3f3fb393fe93b1826e6481ff1