Malicious PDF — malware analysis report

Static analysis result for SHA-256 957a0ab5d8089b86…

MALICIOUS

PDF

81.9 KB Created: 2021-03-30 23:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb617a60e6c984f6363fdea48f19cc23 SHA-1: 17e448bdd3c981cc4212f5cf51ffb0c7d0b21dab SHA-256: 957a0ab5d8089b8640d4263a06e3af961fa63752dd0e97dda62b91758c706efe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://zajinet.ru/strik?utm_term=bill+nye+rocks+and+soil+quiz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481278/normal_5ff3647e8886d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_60494c9c51bec.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/GphhOji/57219335331.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/jbjjHgd/lezepe.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/gjcwggy/247_spider_solitaire_2_suit_green_felt.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/QSKgjih/real_followers_insight_assistant_pro_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_6044bb5899d58.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/KhijgCB/the_crossing_church_chattanooga_tn.pdfIn PDF document text
    • http://gezakiribonenin.mywebcommunity.org/wadepevivagetub.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/chhhaNr/what_does_wehrmacht_translation_to.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/the_bet_anton_chekhov_character_analysis.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/dodixog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_6060068a723f3.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/OijdDib/66040195818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_d531c655d97147aaaaadd099cd6f44c1.pdf?index=trueIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_de72c0907c5b41c9b8e5d87dc5f6b7fa.pdf?index=trueIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_e5f9937185a94785a8c2838b914f33e0.pdf?index=trueIn PDF document text
    • https://67acb2b6-3e42-4063-a073-371cb527a15d.filesusr.com/ugd/a81d48_326f481e700147809dbae7888c426fe8.pdf?index=trueIn PDF document text
    • http://merapenerabari.myartsonline.com/employment_information_form.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_133f3e161a774ad0bb77b5343ceb7c70.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_e53c0b9eadff4c778bdb1e8e2c9f12ba.pdf?index=trueIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/the_natural_book_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 5324 bytes
SHA-256: 729accf58272bcebec5abf92474682a30f07f3c74056935b3f0cbf053a324fc2
font_01_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 11480 bytes
SHA-256: f6acc060222c01fe359f893ac174146ff96cf4c53d7ead3fd42b8ce643fe6f17
font_02_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf