Malicious PDF — malware analysis report

Static analysis result for SHA-256 039e5bc2f97048eb…

MALICIOUS

PDF

99.2 KB Created: 2021-02-23 22:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 06dcacd94b05e1b48f1d56c185fb1ac4 SHA-1: 47da0f8e09d33211a8efaa962ab2db04e44b6765 SHA-256: 039e5bc2f97048eb3500dd7106b40e66349b1c396edb77014e9f1ba86269e1bb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and using UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://seumenha.ru/123?utm_term=arby%2527s+menu+prices+2020+fish+sandwich PDF link annotation
    • https://cdn.sqhk.co/sugutomipu/1xR8tgi/gowomux.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/X70TK3e/kuxanibopamunosose.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/qgc0Fza/retewitovepaz.pdfIn PDF document text
    • http://ditugivovuf.22web.org/how_to_change_code_on_my_sentry_safe.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/iI0ghhj/logidogajonamide.pdfIn PDF document text
    • http://pafugiwerokamez.iblogger.org/b_r_o_ka_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/fuidqjg/to_do_list_printable_weekly.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/7eTuUGF/new_hand_tossed_pizza_dominos.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/ifBiijj/you_had_me_at_hello_lyrics_meaning.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/xumom.pdfIn PDF document text
    • http://fatutidajipen.iblogger.org/the_heart_of_darkness_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/digubamot/Fiaxice/introduction_to_business_statistics_ronald_m_weiers_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/3ggrbgd/origami_box_easy_a4.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/cq2gh2Y/download_game_dream_piano_tiles_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/alFpjft/sync_icloud_calendar_with_office_365.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodagoge.epizy.com/8273873672.pdfIn PDF document text
    • http://wumokobaleto.epizy.com/narujuporifoxud.pdfIn PDF document text
    • http://roripufunubome.rf.gd/losupukojavazirezojemajev.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_off00014033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 5992 bytes
SHA-256: bf0aee0109f4fdaa1c6bcb951c63009ed32f79e0fee759017f375ff0b67b81f5
font_01_sfnt_off0001548b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548B 12720 bytes
SHA-256: c6f4f4b3a00e1325f342adea09fd773a315ce6484cb95270419912f76dbcd3f2

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