Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e77c1821d9da72d…

MALICIOUS

PDF

71.8 KB Created: 2021-04-04 09:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9ad490e16699f17d56522b64f8b86af5 SHA-1: 57132e1821a49fea22da3b9bcb3ded6298de6aee SHA-256: 5e77c1821d9da72d4bd1bcf27fb8ea61209ccd8a19117451c72c515ac0715b28
186 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 6

  • 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.
  • 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://bologen.ru/award?keyword=hello+kitty+coloring+pages+pdf PDF link annotation
    • https://cdn.sqhk.co/nakunadubux/jbicigz/4_pics_1_word_6_letters_pencil.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/ypiahhV/voicemonkey_voice_changers.pdfIn PDF document text
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/7658822.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/4357d4c310836.pdfIn PDF document text
    • http://kulokozataxat.22web.org/annihilator_linear_algebra.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/cTex3SZ/wufopagoru.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/SjgjfTe/betesepanawibugifi.pdfIn PDF document text
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/simuj.pdfIn PDF document text
    • https://cdn.sqhk.co/nadoranur/ejijiYX/analisis_foda_de_una_escuela_publica.pdfIn PDF document text
    • http://xevojifixifepi.scienceontheweb.net/anemia_aplasica_de_fanconi.pdfIn PDF document text
    • https://sakixori.weebly.com/uploads/1/3/3/9/133997256/be7e3b4333199a2.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/gjeifja/73456636709.pdfIn PDF document text
    • http://kevufeduwatawos.mypressonline.com/94399671778.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/mghiSza/spinach_artichoke_dip_cream_cheese_crock_pot.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/1ca731fb277b74.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/4Kibhzz/sexually_transmitted_diseases_infections_kandy_sri_lanka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xevupan.rf.gd/e_banking_services.pdfIn PDF document text
    • http://mutifitiwexo.epizy.com/diagnostico_de_anemia_gestacional.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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 5448 bytes
SHA-256: 7c3263990ab9805ae3c854efa91955dc173c9fb76bef8d18f9db257dba38076a
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 11232 bytes
SHA-256: 3173ace185ec4a08e9928ebd0437116bd3865c74cf4e2cdc90733ce52e3cc258

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