Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a37a1bf88bcbc55…

MALICIOUS

PDF

79.0 KB Created: 2021-03-29 15:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb0d475bc3634fa43358637e3845f470 SHA-1: 14d2a19a1122df00bf6ad17bd86c6bf6b1adfdfc SHA-256: 8a37a1bf88bcbc55be34a30f4b2d4b15084f429cfffe23f353e4593dcac861c7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/award?keyword=architectural+lighting+design+gary+steffy+pdf
    • http://wipunemobak.mygamesonline.org/vakurowavevesisulira.pdf
    • http://nobukuxokosiga.mypressonline.com/antiflatulent_drugs.pdf
    • http://torixewiser.medianewsonline.com/18789392246.pdf
    • https://cdn-cms.f-static.net/uploads/4415077/normal_5fd9a2d3c0c35.pdf
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/voxoneganoxop.pdf
    • http://zigogofarotago.22web.org/jemibevisuxefilomaxujol.pdf
    • http://tabelib.iblogger.org/49944943839.pdf
    • https://static.s123-cdn-static.com/uploads/4427097/normal_6001f18ded380.pdf
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/4cfc7085cb2.pdf
    • http://kasaxeko.mypressonline.com/aadhaar_form_download_in.pdf
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/kifolusolezefukuwu.pdf
    • https://wetokusoxuzufo.weebly.com/uploads/1/3/4/5/134508242/lekoluv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1c15f160-9077-4fab-a650-9c3794232c77/how_did_you_spend_your_summer_vacation_write_in_10_lines.pdf
    • https://uploads.strikinglycdn.com/files/87d84abb-8baa-4dab-a5df-becba59eac1e/how_to_fix_acer_laptop_screen_flickering.pdf
    • https://uploads.strikinglycdn.com/files/504b2857-3ff5-4227-bf72-618200c972d3/fumiwen.pdf
    • http://forubav.rf.gd/gujarat_university_b._com_books_free_download.pdf
    • http://fonimegalidoxu.epizy.com/free_browser_for_open_blocked_sites.pdf
    • https://uploads.strikinglycdn.com/files/ccf67893-44a6-44c1-8263-bf479a8f8da7/34938462320.pdf
    • https://uploads.strikinglycdn.com/files/fc451178-3252-422b-acda-98e0c5dba40e/schlage_be469nx_cen_716.pdf
    • https://uploads.strikinglycdn.com/files/e300aa5d-204a-4c2c-b378-9e1b4e419b36/wexuw.pdf
    • http://dinorafox.epizy.com/wallpaper_hd_1080p_free_girl.pdf
    • http://dusameferadulo.onlinewebshop.net/how_to_refill_ink_epson_et-2550.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c2.bin
460ff8ee23f2923d646a577124f190477a71124d03f2e833f0dc5e7ccd3cc0ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 5508 bytes
font_01_sfnt_off0000f484.bin
a761716c04a552dd0ea654ce953f8f680fc6553957d454caa2f97489a6ce0370		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10392 bytes
font_02_sfnt_off0001186a.bin
15476934db1b555abc94b339ef2cdd5430d129ad0a2ba431483faa4e0cb3d782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 16276 bytes

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