Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f3a082f06361e8…

MALICIOUS

PDF

81.2 KB Created: 2021-04-03 13:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: edb6ab867017d7d1eb069ff7d98963cb SHA-1: da897b580ba4b0cff6cb58a791371ca667842960 SHA-256: c0f3a082f06361e8616687b1f28b8bb4536556978cf42ceb2fe3be325813fdb9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and extracted URLs suggest a lure to phishing or malware distribution sites, disguised as advisories or manuals. The presence of 'curl_errorqkroi.pdf' and multiple disposable hosting links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xezojetit.ru/award?keyword=advisory+jurisdiction+of+supreme+court+pdf PDF link annotation
    • http://feremujidonigu.getenjoyment.net/52512344422.pdfIn PDF document text
    • http://003-center.ru/unit_converter_kn_m3_to_lb_ft3g2vnf.pdfIn PDF document text
    • http://bottlechainworld.com/hp_deskjet_6988_change_ink_cartridgeseuw7.pdfIn PDF document text
    • http://portkamesto.site/php_curl_errorqkroi.pdfIn PDF document text
    • http://ru-dev.xyz/xeroborezigewuwaw5m965.pdfIn macro / runtime command snippet
    • http://ruguwafe.scienceontheweb.net/93898938188.pdfIn macro / runtime command snippet
    • http://pumba-timon.space/53709110434okyv.pdfIn macro / runtime command snippet
    • http://options.expert/tawugomojidinclxg.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/filimofawodatenu.pdfIn PDF document text
    • http://choosenews.space/pokemon_blazed_glazed_patched_rombma1i.pdfIn PDF document text
    • http://usblighter24.site/pizubigezilirakovepaxyz30.pdfIn PDF document text
    • http://ludshop.xyz/movistar_play_mexico_apk47um7.pdfIn PDF document text
    • http://gramnews.xyz/dijobikagunomek2igzn.pdfIn PDF document text
    • http://housefashion.ru/tuxevugonefikenicrckm.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/ba6a8a3e-539d-461f-b209-5e7a13a25061/hp_50g_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/shark_lightweight_professional_iron_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2e7c84-6162-477f-bdcc-5410babac122/wedemolajebimozidagowat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7f2295-cc11-40f9-b0c9-66f8148499c7/83259081384.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/certificate_template_word_online.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/asus_rt-ax88u_router_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/bhojpuri_bihar_video_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965d2feb-b497-4002-b96f-330e6f8eabb1/felopimagurimuzoj.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/brevet_2020_maths_corrig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be595530-5a4d-4156-826b-ff1d4825c9d1/how_much_does_david_make_on_lottery_dream_home.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_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 5168 bytes
SHA-256: c8d2d3754fe7d5d424baea180f98cf5445d9f8d842273a542b31b7d9741e2562
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 11412 bytes
SHA-256: 04c82ec065458a420bc202b17e8588be92180aa3f6ba0a92fa08f12c6ba9123f
font_02_sfnt_off000128db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f