Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65f3b7f153d9faf…

MALICIOUS

PDF

80.9 KB Created: 2021-04-19 18:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d7d9e80e13314883e0b02ef30307928a SHA-1: 80ff1a6a0e90b43da1b6cf899224d7b981ec3d7c SHA-256: e65f3b7f153d9fafc07f4682f264b7cfc0d55eb6115199cf02cc9a5889ad9040
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=how+many+days+a+week+should+a+60+year+old+lift+weights PDF link annotation
    • https://pasiwuguvode.weebly.com/uploads/1/3/4/6/134601834/db843bc220.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/8485fa3b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_604cbb016b6c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443812/normal_5ff2f83a1484e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_5fd62ad11b935.pdfIn PDF document text
    • http://fikipasofesopem.22web.org/74990406511.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/chrome_windows_server.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/xitivediwukedap.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/tuzidesumikifaxodej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_60179f296f48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_600ab9bdaa78e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zixedofa.epizy.com/programa_cervantino_2020.pdfIn PDF document text
    • http://lipelizirivalul.epizy.com/acca_f1_lecture_notes.pdfIn PDF document text
    • http://savefativiluz.epizy.com/is_madden_franchise_mode_online.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/porubib.pdfIn PDF document text
    • http://kefekebew.rf.gd/tikonanonijebel.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/candy_crush_soda_game_app.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/athlean_xero_workout.pdfIn PDF document text
    • http://zokusopejexumub.rf.gd/funny_jokes_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/78541796670.pdfIn PDF document text
    • http://pagumasobud.rf.gd/33117223325.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/29633782885.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_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 5836 bytes
SHA-256: 54befb51f44b542ec61080366fc1dba6c8aebe958a9297f2d244164e941e4567
font_01_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 10560 bytes
SHA-256: f97ca9c041a14496e5617f612249d732bb999bc1be3b090ae41c25eae5cb61f6

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