Malicious PDF — malware analysis report

Static analysis result for SHA-256 36046e0ae83fcb24…

MALICIOUS

PDF

77.1 KB Created: 2021-03-10 21:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6723e08a7cccc51894231d8597b3c9e8 SHA-1: cf299a592cead9037701abe55880e722d38b9a72 SHA-256: 36046e0ae83fcb24b6f4031bc8bf61e990c1e95d6b2a6f72ff026a7c209e99b0
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 pointing to external link farms hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for SEO manipulation or to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=media+nutrient+broth+adalah+pdf PDF link annotation
    • https://cdn.sqhk.co/fidakasari/4njbggf/gosurogosolisawiledosipa.pdfIn PDF document text
    • http://erogan-columbia.site/hammer_house_the_jumper8t4o0.pdfIn PDF document text
    • http://tryplafond.xyz/343144499915vpv8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_602891901c348.pdfIn PDF document text
    • http://nudistoff.club/cbse_compartment_exam_online_form_2019389py.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fdb2f8d9620f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_5fe7c1b2b99b5.pdfIn PDF document text
    • http://aycotoro6.xyz/free_twitch_follower_alert_soundsqa1ke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384832/normal_5fe100f90ccaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_5fc8d2840c1d6.pdfIn PDF document text
    • http://domainlimax.xyz/what_is_call_to_action_in_literatureap048.pdfIn PDF document text
    • http://sushibara.net/29147015099ghctx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_601f7963bb943.pdfIn PDF document text
    • http://esmoney.site/social_construction_and_essentialism_in_gender8eee9.pdfIn PDF document text
    • http://chaptejvxz.fun/safety_1st_baby_monitor_app8ohxp.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/WIjijwV/suluwovepedawuwuzixige.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/jdihzie/bawavesufugo.pdfIn PDF document text
    • http://migerov.xyz/best_anti_bark_citronella_collarwb66f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b19e2e1-1957-4bd0-8757-944ce6eb0240/62709112478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9cb2c18-6a4b-481b-b093-ee5c3b6ee5cd/how_to_take_apart_a_4l80e_transmission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a497df72-f848-4026-ae74-757617474aa8/88125126415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07462df0-31c2-4019-917c-bc85d70f4cd7/american_standard_ac_blinking_red_light.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_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 5096 bytes
SHA-256: 6c40302bce02f249c9b021d567b16f4af3a579cfd9475813951975fcf8c9ef9f
font_01_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 11016 bytes
SHA-256: e53dbb43254f4c312603d04d259c88040a87c4add930683086a93f387f4adf54

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