Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a542cd4fb7da1c…

MALICIOUS

PDF

74.6 KB Created: 2021-04-29 22:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe5a76f7f894441576d71d89d146ea60 SHA-1: 75ad3d1e069ffd78dadd134d3faa573bf8acc509 SHA-256: 34a542cd4fb7da1ce371bdb69c52ec323f8e0264ce7f771a487940949650fa44
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to starting a business. The presence of external URIs and a link farm on disposable hosting further supports a malicious intent, likely to redirect users to a phishing site or download further malware.

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://resalured.ru/strik?utm_term=how+to+start+appliance+repair+business
    • http://biraxubidu.22web.org/jebodofimi.pdf
    • https://cdn.sqhk.co/vavewiminiv/RjjGhiU/the_american_civil_war_a_military_history.pdf
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/bawas.pdf
    • https://mototide.weebly.com/uploads/1/3/2/7/132710683/dce8407cd28.pdf
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/6065308.pdf
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/9b75a0.pdf
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/1667319.pdf
    • https://cdn.sqhk.co/ximegawaso/xEiiYjh/video_status_whatsapp_app_download.pdf
    • https://mewurotimopu.weebly.com/uploads/1/3/1/3/131381658/6138543.pdf
    • http://xekinivafu.iblogger.org/what_is_light_relief_meaning_in_hindi.pdf
    • https://cdn.sqhk.co/bowawugafux/jjdkgcP/police_officer_exam_for_dummies_free.pdf
    • https://kunajulitamajel.weebly.com/uploads/1/3/4/5/134530001/1150807.pdf
    • https://cdn.sqhk.co/divoxisig/iX0miBH/patirozogerorinazekulamek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/901d8809-f4c0-454a-aa5d-c50430a6cdf7/cules_son_los_misterios_luminosos_del_rosario.pdf
    • https://s3.amazonaws.com/ninasivol/smc_compact_guide_cylinder.pdf
    • http://ropobowex.epizy.com/acura_tlx_2018_manual_transmission.pdf
    • http://kajebaneba.epizy.com/cakephp_beginner_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/e613e515-93ae-46fc-99b8-5062df5878da/lodopifabagugitepu.pdf
    • http://xotoxekawi.rf.gd/medical_examination_report_format.pdf
    • https://uploads.strikinglycdn.com/files/ca23a7ac-b99d-44a8-8164-ab07d1e47aad/words_to_describe_deep_poetry.pdf
    • https://s3.amazonaws.com/nilafafakem/noxari.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89b.bin
653b9ea9b9c425815963ce9e5b580e8b4525d08b98eedf3de26f2035a9e73496		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 5120 bytes
font_01_sfnt_off0000fa20.bin
66640c43c19122d101fe4fbf74ea68782fde1d45f8aac1f1373f7f3ce05fc2d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 10248 bytes

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