Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c99ce1095f1876…

MALICIOUS

PDF

81.7 KB Created: 2021-03-31 01:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a254cd550c30d5c3af899331632c126b SHA-1: e09c2e13995aa5a3c0cbe80eda07348942df8977 SHA-256: 73c99ce1095f18761aa7c370a7400d4ed36d9128334dd008695ccb8ffcf17a8b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan-like behavior. The presence of a large number of external links, including one pointing to 'dafemum.ru', suggests an attempt to redirect users to malicious sites or engage in SEO spam. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to exploit vulnerabilities or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=game+of+thrones+book+series+in+hindi
    • https://rupuxiziwaxez.weebly.com/uploads/1/3/4/7/134765543/bovijaxuvava.pdf
    • http://sepozimog.scienceontheweb.net/keeping_your_cool_the_anger_management_workbook.pdf
    • http://pirojibanenuzi.getenjoyment.net/treatise_cornelius_cardew.pdf
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/3642992.pdf
    • http://vukufitu.mywebcommunity.org/exercice_adjectif_qualificatif_epithete_et_attribut.pdf
    • http://wapividazofar.scienceontheweb.net/6300217431.pdf
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/zovepofofutame_fugalenejubuwa_vofenowije.pdf
    • http://rivozuzeno.mywebcommunity.org/63021708957.pdf
    • http://fomijegi.mypressonline.com/71315314080.pdf
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/95e38f84bf01f.pdf
    • https://zanubago.weebly.com/uploads/1/3/4/8/134886268/wogifo.pdf
    • http://wedipum.mygamesonline.org/lebotavovojizipemekex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fopalew/how_to_turn_off_adt_smoke_alarm_beeping.pdf
    • https://s3.amazonaws.com/salosibejodod/93160269668.pdf
    • http://dejamatokato.rf.gd/anjathe_tamil_video_song.pdf
    • http://domuromu.atwebpages.com/dd_wrt_router_mode_no_internet.pdf
    • https://s3.amazonaws.com/bitajemisajoz/degagubawigebowu.pdf
    • http://godutugogusapa.rf.gd/forajovivaxebipuraxatizot.pdf
    • https://s3.amazonaws.com/dovulavavo/63129731303.pdf
    • https://s3.amazonaws.com/gonasidupij/what_does_the_term_along_for_the_ride_mean.pdf
    • https://s3.amazonaws.com/dozore/59561753746.pdf
    • https://s3.amazonaws.com/xamibudasagas/girovola.pdf
    • http://dutinafojev.epizy.com/42957579048.pdf
    • https://s3.amazonaws.com/jozaponi/playa_hermosa_jaco_costa_rica_surf_report.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_off0001023d.bin
9f7a37bd8f0e5971cfc5b8195d237099d356e61b633d15b8432c298d5cb2e74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 5348 bytes
font_01_sfnt_off00011442.bin
b60caf704bf4acf354454c4578b8624e29a63fe7bec5f105b73727021741d03e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 10964 bytes

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