Malicious PDF — malware analysis report

Static analysis result for SHA-256 a928668b90c3d2f2…

MALICIOUS

PDF

73.4 KB Created: 2021-03-28 19:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7941706ab8038edc22578f071bc92782 SHA-1: 5e29803c3c2d5a797120694d11b558115b6af5c1 SHA-256: a928668b90c3d2f268706da7c3af38be340b6916a8315f336e9e381d38e18755
156 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. 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 0.9998

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 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.
  • 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/award?keyword=bildad+kaggia+roots+of+freedom+pdf PDF link annotation
    • http://visetazide.medianewsonline.com/19571359127.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/abrupto_placentario.pdfIn PDF document text
    • https://dirukarizudabi.weebly.com/uploads/1/3/2/3/132303081/girizo-wabapoxowamufa-sefojugorum-boxusobinesip.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/rebexuvup.pdfIn PDF document text
    • https://jusisobopat.weebly.com/uploads/1/3/4/3/134326654/748fce7b4ed0581.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/1695532.pdfIn PDF document text
    • https://topirameji.weebly.com/uploads/1/3/2/6/132682330/fodikapaxagez.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/togivekuw.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/introduction_to_social_psychology.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/nefunupu/how_to_calculate_mass_flow_rate_of_exhaust_gas.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/simulink_hdl_coder_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/fetapumerinasosa.pdfIn PDF document text
    • http://lirejomirun.epizy.com/32924143460.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/zojelatutukepubakonovi.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/do_dryer_sheets_kill_dust_mites.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/bell_s_palsy_rehabilitation.pdfIn PDF document text
    • http://wewiritat.epizy.com/calendario_ascenso_mx_apertura_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/reportit_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/high_heel_platform_boots_cheap.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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 5476 bytes
SHA-256: 0b551186d9c578cac2a3dc6232dda4bbeffdeccfed9bee04ba87f3216853c753
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10508 bytes
SHA-256: 10e776138293e0af8c0a45a90986169dc033a997c454d6765785ecd69498aa66