Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6db3af49f94f3a…

MALICIOUS

PDF

80.0 KB Created: 2021-03-16 00:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: df7d74c4914d7321465a14ee1a4d161f SHA-1: dcf317c26adde9540d95f9a3ea4f1bbf06342dff SHA-256: 6f6db3af49f94f3aa568c53c76d7f52d0cf2491a4871e72cb2554bd164e0aa48
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that uses a lure of 'Past perfect tense exercises worksheet pdf with answers' to trick the user. It contains a high-risk heuristic firing for a PDF SEO UTM redirector link pointing to 'https://baarspo.ru/award?keyword=past+perfect+tense+exercises+worksheet+pdf+with+answers', indicating a phishing or malware distribution attempt. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/award?keyword=past+perfect+tense+exercises+worksheet+pdf+with+answers PDF link annotation
    • https://cdn.sqhk.co/lugizumevemu/a7Ohgif/92191381468.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/kngd0Rx/form_i-_864_poverty_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_60185e908d20f.pdfIn PDF document text
    • http://zdsshop.top/bengal_tiger_tamil_movie_720pbk7se.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_600bef3e71cca.pdfIn PDF document text
    • http://doweryklkq.space/buvujomosufu5rge5.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/AZE8jcS/barawupised.pdfIn PDF document text
    • http://es50off.pro/111495334350vgtj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5ff0239ff22ad.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/megodipewukitoj/how_to_know_if_an_outlet_is_gfci.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/cybex_pallas_2_car_seat_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/tokekoxilivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e008ed99-1f70-4bb3-8cfd-c55d1946ab91/21092105551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b2b054-ee22-4cf4-8b0f-7d9454ae9359/cnn_latest_world_news_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6037e3-4146-44fa-8fea-3fcb6b2a6f65/xofimevapavesawasimewuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/wapawobiruzik.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/wukenixabelifavimikufimez.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/pedagogy_mcqs_with_answers_nts.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/fidemipilevumasuwosexare.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/30028276146.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/44837780587.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/52927409581.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_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 5436 bytes
SHA-256: c3087b77047b4ad3c2709e498e357ef5bbdcd0d3036f151d5636b72ccd12ad9b
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 10652 bytes
SHA-256: 2c98695e88a21593ce390afa0740c5a2794d496549f156e1a8b44f8d8d45ef02

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