Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16461fd9f0f8216…

MALICIOUS

PDF

91.4 KB Created: 2021-02-28 11:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 45ee5c024d45fdee56a482d6f39f6c03 SHA-1: 3afc833834174eef7a51590929f7172c9f37cba5 SHA-256: d16461fd9f0f8216472df3170607e84bb4b47a26173d199993604ae4df78539c
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating a large number of external links, with one pointing to a URL related to a technical issue. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=samsung+tv+won%2527t+turn+on+with+alexa PDF link annotation
    • https://zenerabu.weebly.com/uploads/1/3/4/8/134870876/2554240.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/hbjigjt/basic_marketing_strategies_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/ihhIghG/callaloo_journal_book_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/jgjgWAo/ultimate_background_eraser_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/gezQijZ/35656265711.pdfIn PDF document text
    • https://cdn.sqhk.co/rijizedot/WlUjgFS/59061381851.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/diiPGIa/rope_ninja_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/GJCkidW/elevator_room_escape_walkthrough_spotlight.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/gfThe5k/shiv_khera_quotes_wallpaper.pdfIn PDF document text
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/3844387.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/HDSgjhh/survival_island_movie_online_youtube.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/44574.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/636682.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/jjxhuih/find_my_friends_phone_tracker_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/gjeifif/worajexolexe.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/nasitevu/business_case_free_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/31581740591.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/joomla_templates_free_2019.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_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 5456 bytes
SHA-256: 94f943bd41b95d7fbf4a849d0ffaf9668e910cb6ae24053adb6924594ae67a25
font_01_sfnt_off0001350e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350E 12544 bytes
SHA-256: 737e0e0dc0fe357158213208b50aa9f9ff546fdb8153e6ba7f36897330e3cf2b

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