Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f20e1e4ab64bb1…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 12:33:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 02721a75c6a54b210c90164eb04b2305 SHA-1: a9189e670f764cece1b4b95f1d1432b253d6d066 SHA-256: 85f20e1e4ab64bb1b41527d161776e1a0fef7267593c6266b2b3f1a3cdf19041
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's content, though heavily obfuscated in the provided excerpt, appears to be a lure related to an economics worksheet, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jacksth.ru/wix?keyword=economics+factors+of+production+worksheet PDF link annotation
    • http://normaa-id.com/lao_alphabet1h25b.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/c885fc52f1eb76.pdfIn PDF document text
    • http://plafond.xyz/belmond_ellen_ragnarok_mobile_answerswx5mv.pdfIn PDF document text
    • http://ragixanomus.iblogger.org/aspirating_smoke_detector_design_guide.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/american_red_cross_jobs_buffalo_ny.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/what_is_a_digital_communication_specialist.pdfIn PDF document text
    • http://riragukigud.scienceontheweb.net/vaguseza.pdfIn PDF document text
    • http://trells.space/value_investing_club_fordhamssbw0.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/muveroxu.pdfIn PDF document text
    • http://redit.fun/nomepifodiretok9cn2.pdfIn PDF document text
    • http://55571.ru/how_to_make_freckles_go_away_with_lemon_juicentr3b.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/jujosorenasimatak.pdfIn PDF document text
    • http://dipugipedanam.sportsontheweb.net/luzufavatak.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/atrocity_act_in_gujarat.pdfIn PDF document text
    • http://bigijawiv.scienceontheweb.net/titetulimiguteta.pdfIn PDF document text
    • http://kolagiriwu.22web.org/67810217023.pdfIn PDF document text
    • http://fedezin.scienceontheweb.net/vovopevex.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/fibedapuzu-majoletevepup-kuputapovomonor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevapugono.atwebpages.com/log_table_book_download.pdfIn PDF document text
    • http://jovurafop.epizy.com/kavubofobotogas.pdfIn PDF document text
    • http://refomuvuves.rf.gd/73681652096.pdfIn PDF document text
    • http://vojofixijiro.rf.gd/sel_limfosit_adalah.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/bujomudogux.pdfIn PDF document text
    • http://zorogeloma.epizy.com/combining_sentences_worksheets_3rd_grade.pdfIn PDF document text
    • http://fibobaxemod.rf.gd/82771107974.pdfIn PDF document text
    • http://sujomux.rf.gd/13605629992.pdfIn PDF document text
    • http://zedotedifajo.epizy.com/ain_t_it_funny_song.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_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 5476 bytes
SHA-256: 2f3715ab6bd4e4c3dd5b6dab1fed79f57653c52c34b247bec3df4c4d4ca33ea1
font_01_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 10412 bytes
SHA-256: e197342c3d7772c9ff5f738f175f73f28f8a90a5ee15b5a5239467b04b1fa954

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