Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8ff5ea509acab3…

MALICIOUS

PDF

76.1 KB Created: 2021-04-27 23:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bba9188540571cdca40b83ab68607f60 SHA-1: 7c7657e8894c44506a6a9977206f8baa0638d29c SHA-256: de8ff5ea509acab3ec339ecb09e61a3fbe40deba80c298a81e94258f00354442
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 7

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/strik?utm_term=primus+brake+controller+sh+code PDF link annotation
    • https://xejuzofuna.weebly.com/uploads/1/3/4/8/134858051/3343154.pdfIn PDF document text
    • https://dagatofolake.weebly.com/uploads/1/3/0/8/130874029/pijenebivuj_simivukifa_foxapime.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/dQZ7ijE/spaceflight_simulator_full_version_1._4._06_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/YyLhdhi/shortest_fast_bowler_in_cricket_history.pdfIn PDF document text
    • https://cdn.sqhk.co/dugarusa/gi9ic1Q/93334766312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_60460e4dcc490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_6027041cb8d40.pdfIn PDF document text
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/9961114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60655056a883e.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/ijbffDw/word_market_2_level_40.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/hgihew4/44009071772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da25564d-e3c2-4b9b-87ba-dd8ce2ae78d4.filesusr.com/ugd/c82cd6_91fabe25b1e54ba8a5ea26239abba48a.pdf?index=trueIn PDF document text
    • https://fdf0fb27-5181-4190-8e1a-80fb86d87eb1.filesusr.com/ugd/2410c9_a67a7bb4c9bd407d87e796f9926b022a.pdf?index=trueIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_4e6e3feed6334434b56ff494b92945bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/brooklyn_99_episode_guide_season_3.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_7eeb72276a6443a6b41ecdf66bf52ff4.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_8b7a573d92754eb6aba71e95ed0018b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xixonu/a_certification_exam_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/aligarh_muslim_university_form_for_class_9.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/how_to_use_john_the_ripper_password_cracker.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_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 5384 bytes
SHA-256: 8081d4f09b354a207b4fd0f23a23d9c0db6359314f43c4d6e3f0d821b2a27b54
font_01_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 11088 bytes
SHA-256: be9a001f6c0694784aa9be05b707353333fc7e7597a984fc81170e8cff318b9a