Malicious PDF — malware analysis report

Static analysis result for SHA-256 923394cc01599cc0…

MALICIOUS

PDF

72.3 KB Created: 2021-02-16 07:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1dd46f4b0b951c5f0c903a78b060f867 SHA-1: fbf49aa7dfbfa5996e9f4ca253577c47ab1e42bf SHA-256: 923394cc01599cc0378614a3f14f3dea29f89fdc5a73eec6f44c903093f63ba1
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=beowulf+works+cited In PDF document text
    • https://cdn.sqhk.co/tememagitapo/hnnMCer/city_car_driving_download_pc_windows_8.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/iIeyii2/juregupoguxapo.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/tjaBjam/18221903627.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/furewogusakimed-mabit.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/hhiTieC/video_editor_freelance_hourly_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/gjNighj/waroten.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/e7gfgcC/rugby_league_9s_2020_finals.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/aQvidii/69427956847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femodizabofowu.epizy.com/compound_interest_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/apprendre_le_franais_gratuitement.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/army_bus_driving_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/sowavadoguzufimijos.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/non_disclosure_agreement_template.pdfIn PDF document text
    • http://csis.pace.edu/grendel/projf981e/main.htmlIn 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_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 5012 bytes
SHA-256: eb6c6975fb6898132e0675c68a0cb208ed0db0db5a0fdd14cd3dc15ce3960170
font_01_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 2384 bytes
SHA-256: 4db5e4b9cdb19604e1d8d4bcdbd41f5244decf55b1d806f1cee39be11c820b5d
font_02_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 10528 bytes
SHA-256: d0886636f401d584bd12fc5d8a506a560318fe20dc125dbe2809671a4ecc41b4

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