Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc31e54504c24485…

MALICIOUS

PDF

91.0 KB Created: 2021-03-29 07:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 913f15ba8ea1c4d4a7303dfffad52aeb SHA-1: 461c13026c51d3e91124f41f8a77d9bccd272a47 SHA-256: fc31e54504c24485f79f2bda2ec7c88f5fc5a530b4844b75ad483515cbd99dfe
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with several pointing to unknown or suspicious domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'income tax return estimate 2020', aligning with a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/wix?keyword=income+tax+return+estimate+2020 PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/audit_procedures_for_cash.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/english_bible_king_james_version_free_download.pdfIn PDF document text
    • http://potuduwatolebu.mywebcommunity.org/3d_pencil_drawing_techniques.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/luwukij.pdfIn PDF document text
    • http://povar2020.site/ci_t_modem_alcatel_lucent_i-240w-a7g2i6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/77669af6-0fc7-47ca-a588-89bf1743ef23/audiocodes_mp_114_fxo_gateway.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/poweredge_m830_blade_server_datasheet.pdfIn PDF document text
    • http://kofufinaniba.rf.gd/89706968602.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/how_to_determine_level_of_proficiency_in_a_language.pdfIn PDF document text
    • http://tukakuze.epizy.com/forget_your_troubles_line_dance_stepsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5498778-3ae8-4cf5-9dba-e0a0f8c8539a/google_maps_street_view_not_working_august_2019.pdfIn PDF document text
    • http://vopisatewegom.rf.gd/53393212934.pdfIn PDF document text
    • http://funonezebiv.rf.gd/10057978673.pdfIn PDF document text
    • http://febagilelefejen.epizy.com/16757025422.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/china_visa_form_south_africa.pdfIn PDF document text
    • http://fonojuw.epizy.com/81495601267.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/filudugegedewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7eb7d59-d491-46d1-84a5-dace70032cce/how_to_connect_simplehuman_mirror.pdfIn PDF document text
    • http://dusiwesidixe.epizy.com/nekegiperefolozab.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/14714376784.pdfIn PDF document text
    • http://demuremapinob.epizy.com/anti_theft_alarm_for_bikes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 5072 bytes
SHA-256: 322d05c55fb918a2af30d957d1dc186845ff3d70ad5fa58668f4205767f9316d
font_01_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 11264 bytes
SHA-256: 8358414f553cb7eb458b8ad8a92e266fcac999abff846cae7e1f06c49b565053
font_02_sfnt_off00014fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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