Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76fde1d118b5e20…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 11:10:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e5ba8cbcf89a93dc7affdd9a0ddee92 SHA-1: 58dcf19e42c589fce3fe4b93020dafd6b1be9348 SHA-256: e76fde1d118b5e200af5583b04d696230ea163c470c23a2a9b556e22aa0e8dbd
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains and link farms, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a 'smart bracelet', suggesting a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=how+to+turn+on+smart+bracelet+d18
    • https://cdn.sqhk.co/luwibajik/5EM7shj/28406720809.pdf
    • http://lnstagramverifiedsbadgesforms.com/8995025103xzxm4.pdf
    • http://korezafegedim.22web.org/84211925038.pdf
    • http://lnstagramsupportinfo.com/zudetokavemaxajleknj.pdf
    • https://cdn-cms.f-static.net/uploads/4372377/normal_6026a35e34fd9.pdf
    • http://demask.fun/feluwevawuwusevidavozija8sab5.pdf
    • http://zunuruxeguxifi.mygamesonline.org/logitech_k120_wired_usb_keyboard_review.pdf
    • http://redirerer.medianewsonline.com/interview_english_test_with_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fd91d83c1f4e.pdf
    • https://static.s123-cdn-static.com/uploads/4381551/normal_5fcb49b3d45a6.pdf
    • http://ribadubeko.scienceontheweb.net/neil_postman_the_end_of_education.pdf
    • https://cdn-cms.f-static.net/uploads/4390642/normal_601494bc7ab01.pdf
    • https://cdn.sqhk.co/pozusonitid/Liaiaij/xufexupekefomexepugudubok.pdf
    • http://wuxetij.mypressonline.com/29274095832.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7579fe80-81cf-44a1-8514-24302f898b1f/bible_esv.pdf
    • https://uploads.strikinglycdn.com/files/77e93a68-7905-40b0-84cd-f5f5c7aa3c3e/how_to_get_the_most_heat_out_of_a_wood_burning_stove.pdf
    • http://junanigemos.epizy.com/94345214392.pdf
    • http://mozabufapimil.epizy.com/vupobemikif.pdf
    • http://givobipuxox.rf.gd/physics_constants_list.pdf
    • http://nutimuratibuzur.epizy.com/escalation_protocol_guide_destiny_2.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_off0000e5d9.bin
90958bc923e771c56e77e984cc463c1b26568cde3560686427cb379f6592ed6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 3036 bytes
font_01_sfnt_off0000f097.bin
eab4e82c0fdd79a2a627176a93c93e8655a16479f933aed2bb4d42bf74975d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 5524 bytes
font_02_sfnt_off00010354.bin
598606e6644968ca072ee28323b3fe9d0ccdf1cc3fd2b9996a42b424eff3e453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 10860 bytes

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