Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebac8ecb50fd8406…

MALICIOUS

PDF

79.4 KB Created: 2021-04-12 10:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f79ba0ea2fcb4c0e76fd76d381a838ac SHA-1: a7807012797a3a22047add4a10290d09e1a3d46b SHA-256: ebac8ecb50fd84069b996387d9f752c05735a5f018fe7e3c83832cf91000fa2e
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a malicious redirector, specifically designed to lure users with an image related to Christmas lights. The primary malicious URL identified is https://yafferge.ru/strik?utm_term=warm+white+christmas+tree+lights+outdoor, which is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/strik?utm_term=warm+white+christmas+tree+lights+outdoor In PDF document text
    • https://cdn.sqhk.co/jexozumumanu/qqicOjb/damutonesoxof.pdfIn PDF document text
    • https://cdn.sqhk.co/bupusudiva/dvyjegs/minecraft_download_free_download_java_edition_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388067/normal_5ff9e3184e1b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_603abd082939c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_601973270a480.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/ugijdeP/ar_cake_bakery_fun_cooking_game_my.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/escrboK/grand_theft_auto_iv_ps4_store.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/djgjhjc/logiciel_de_gestion_d_une_pme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_60399e11c1b54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5ff82d8a09a89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/murudute/whitfield_quest_pellet_stove_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf41312e-a068-41e4-9eb5-0404b9e2046f/roomba_560_error_5.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/sample_ielts_listening_test_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb66821-bcec-4cd0-89ee-c97172f0d265/21621096624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ff3aa9-48f7-433f-8c07-66d847c8f685/what_are_the_economic_activities_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/5_love_languages_child_quiz_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/60548801790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b255563b-b0de-4c5a-9160-c76523aa3654/depugufotus.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/ich_guidelines_for_stability_studies_of_tablets.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/crockpot_dump_recipes_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/the_return_of_the_king_extended_edition_runtime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805eae58-a23d-4267-921b-1424835c5704/in_christ_alone_brian_littrell_chords_key_of_c.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_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 5460 bytes
SHA-256: 042bfd119faaaa2f21be896e544d0efd368c2ddf094974b0e3a052f164f4dc3d
font_01_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 10772 bytes
SHA-256: a165339ee4cba7c55b616f493308230203c15016b0f468369c8ac16266657bcf