Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1944e7103a7d61…

MALICIOUS

PDF

76.7 KB Created: 2021-03-14 04:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 0077c5f9729fcc61eac370d2ba4d98f3 SHA-1: 19dc08b391cf7cde188b1c16d8d1928c7aec741d SHA-256: 7b1944e7103a7d61c5b192b884c287869f92e261861f204c04aa8edaef46c36f
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, https://crophysi.ru/wb?keyword=how%20to%20change%20grub%20conf%20file, is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of malicious links suggests an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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://crophysi.ru/wb?keyword=how%20to%20change%20grub%20conf%20file In PDF document text
    • https://cdn.sqhk.co/nojebimit/idiHrhg/gutschein_amazon_kindle_unlimited_offer.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/giig6hb/love_live_wallpaper_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/fr9heAY/real_space_images_hd.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/refimidu.pdfIn PDF document text
    • https://cdn.sqhk.co/kukojuvata/ijBmjcN/69605172813.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/vhhPBgi/timunuwenolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_5fd61a3a64454.pdfIn PDF document text
    • http://penutiponexeb.iblogger.org/30611410798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403421/normal_5ff970f8a79d6.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/cijSkrY/toddler_only_says_words_that_start_with_b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd661d801b1c.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/hfXpiht/sling_blue_and_orange_comparison.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/rhiihep/free_heroes_2_enhanced.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463034/normal_5ff1c41d54b0f.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/ijfRig1/intex_jungle_adventure_play_center_57161.pdfIn PDF document text
    • https://cdn.sqhk.co/dulemokel/aNPjh20/pogiwupupolarukibuwo.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/mefadedosuw/what_does_te_amo_mami_mean_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/minitab_18_statistical_software.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/english_worksheets_for_7th_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/apspdcl_jao_hall_tickets.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/xivoxikuxemepojiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/63527655351.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/26415470550.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/danebomusi.pdfIn PDF document text
    • http://lemujiv.epizy.com/credit_analyst_cover_letter_template.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_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 5156 bytes
SHA-256: b7aafa5a4c7eb7f7cb84db1fa6fb634589bd9210d450074394e3fd8168e4f3e1
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 10692 bytes
SHA-256: 8a49d06b73a4e0867291491aaff35ac785c02a689de4ab4f925f5001aee0470d

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