Malicious PDF — malware analysis report

Static analysis result for SHA-256 267d15786f17d79d…

MALICIOUS

PDF

74.7 KB Created: 2021-02-08 20:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e17dbb442b7395bbadb69e7dbcb5347 SHA-1: 72ada7942f169ec0c426b31dfe4a48c70c04979c SHA-256: 267d15786f17d79d1681c0dc797cabbd4bacb39c589735e9c50b0f958cc4ed40
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. The primary malicious URL identified is `https://yafferge.ru/wb?keyword=swagger%20ui%20editor`. The presence of these links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/wb?keyword=swagger%20ui%20editor In PDF document text
    • https://cdn.sqhk.co/pavujakorige/UdiY7Pi/ink_master_season_14_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/cGTggRd/didibajokererefi.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/Niaid56/kekofojosinu.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/wiremegunejuwofebevu.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/zitetubaf.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/yieUMU4/57463637924.pdfIn PDF document text
    • https://cdn.sqhk.co/damapegapi/hghHjfT/bofagojakuwavu.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/j5ieif1/search_quran_in_roman_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/ihhQwic/vexamiwevixodeki.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/gfXgjif/second_hand_sofa_set_for_sale_in_qatar.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/bgcLL7q/natural_s_nails_salon_allentown_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/eijhcBK/red_ball_4_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/aO6wgg4/top_100_pop_music_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/d2o8nzS/rumabigagasewet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosijatigatu.epizy.com/sowufuziwuko.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_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 4976 bytes
SHA-256: 1be34715bb1e70ac55a9721c99546e6443f136041406e93a9e9ceb4d1c922f4a
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 1800 bytes
SHA-256: 9db478dec4231c34d7d748c08d178dd4fa91ce1c226d21d72eae50ce414127f2
font_02_sfnt_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 10804 bytes
SHA-256: e86628af0d4dcb5b5ef91870082254ee2ae09bb0be0abcb78d7a54ffa8b43479
font_03_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 16036 bytes
SHA-256: a7fd1637f88583be41db22b6c1c7d99d29655ed450f70959f8206d6f961c8101

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