Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8a6fa474b97f54…

MALICIOUS

PDF

83.4 KB Created: 2021-03-14 15:28:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3acdde3d4123992592c9a56d8a5a8ea3 SHA-1: a70b7ad5a0d94a7745128d848fc87cae97c1c9ff SHA-256: fb8a6fa474b97f54f5087248cd5d0c13e1e138399a5c8c82a53ae470bad918e1
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, potentially disguised as a download for 'ethical hacking books'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=ethical+hacking+books+in+tamil+pdf+free+download
    • http://befotuke.mywebcommunity.org/does_powerlifting_build_muscle.pdf
    • http://pirojibanenuzi.getenjoyment.net/24928686590.pdf
    • http://itanto.space/wd_tv_live_media_player_apps9v225.pdf
    • https://cdn.sqhk.co/jaxubefe/Khf8hhE/87902032899.pdf
    • https://cdn.sqhk.co/dedizozife/ggcPEcW/stack_on_gun_safe_manual.pdf
    • http://grinallex.shop/ionic_3_angular_4_tutorial3468o.pdf
    • http://luxuwum.mypressonline.com/right_triangle_trig_finding_missing_sides_and_angles_worksheet_answer_key.pdf
    • http://sevezor.scienceontheweb.net/wumizubafama.pdf
    • https://cdn.sqhk.co/towevefizub/gzs0jg2/36555147755.pdf
    • http://furniture21.online/how_to_use_proofreading_marks_in_microsoft_wordtzbp8.pdf
    • https://cdn.sqhk.co/vesagivara/giggfrI/17533660041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/91256aba-ec08-4bde-8978-02f8e4b324b7/49978189015.pdf
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_09130b69d8b840e6b85817a3421e40a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38a790f8-dc97-4acc-925d-b290eba0dbb5/rewapokurudetelanadi.pdf
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_737b82a8d2d84460914b4dbe3e468b11.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0140bf54-3e09-44dc-bf56-09da7d8d5efb/asus_xonar_d2x_xdt_a.pdf
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_3f65738bbd784e6885ac97c80d3d2381.pdf?index=true
    • https://uploads.strikinglycdn.com/files/320c6aa0-436d-4e2c-b300-0c38aa147ad4/precalculus_with_limits_answers_chapter_4.pdf
    • https://uploads.strikinglycdn.com/files/2b579e03-61e3-4494-9814-916f977d651c/xupuf.pdf
    • https://uploads.strikinglycdn.com/files/a3d4bf40-0bf5-4fc1-ae34-736beec625df/59480278973.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa33.bin
dee8458a55436f175eba399ddf50885c9372656469329ee2abcec8ea085c1c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 5612 bytes
font_01_sfnt_off00010d19.bin
ebc5f18c0d8920c4db502abfc39f283481e675ba2c29926285f5573ef0622bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 10756 bytes
font_02_sfnt_off000131b7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131B7 4324 bytes

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