Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d05dd602cb01a3…

MALICIOUS

PDF

72.7 KB Created: 2021-03-31 00:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e4063d49512d9486f046d0d8a0592903 SHA-1: d4074d2896aa070ada260ed084632e0ae827a8f1 SHA-256: 53d05dd602cb01a382d27eb5a5ce5574475e3285625c5169ab0c6b25db338d77
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by heuristics as a link farm and a phishing/trojan distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords suggesting a lure for search engine traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=infinity+war+google+docs PDF link annotation
    • http://hdvideo.design/pupugakefusosejrg5v.pdfIn PDF document text
    • http://tersq.space/95707019216dfazp.pdfIn PDF document text
    • http://fabulouss.space/windows_7_activate_key_freerbr0g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498997/normal_600308d37d60a.pdfIn PDF document text
    • http://openchambre.xyz/navistar_isis_service5s7o9.pdfIn PDF document text
    • http://pe50off.pro/bansidhar_ka_song83unu.pdfIn PDF document text
    • http://ideaita.fun/how_to_change_aspect_ratio_emerson_tv72x19.pdfIn PDF document text
    • http://islandlandscapesbb.com/what_are_the_basic_elements_of_poetry1j2gg.pdfIn PDF document text
    • https://beponuju.weebly.com/uploads/1/3/4/6/134626977/luwetiwire.pdfIn PDF document text
    • http://batut.space/17872215191wl7ev.pdfIn PDF document text
    • https://tuvajidemagik.weebly.com/uploads/1/3/2/6/132681445/lebadev_lurupu_najet.pdfIn PDF document text
    • http://cucoupon.info/haareya_song_salimtoi7y.pdfIn PDF document text
    • http://bit7.top/pebito7yliz.pdfIn PDF document text
    • https://xomugiwonin.weebly.com/uploads/1/3/4/2/134266294/mazijad-vezerovijaj-guxumufusinipa.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/actron_fault_codesa6iko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5fcf6a26840f8.pdfIn PDF document text
    • http://theplafond.xyz/7725279264106nr4.pdfIn PDF document text
    • http://smcjd.com/95898386761a94zs.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/selivuvumepaveb/sony_dsc-f717_memory_stick_compatibility.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/blokada_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/72816087035.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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 5320 bytes
SHA-256: ad61e9dd5cb41238d37573ae0e9f26981395967764b36abc460cee68f31c6438
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 11088 bytes
SHA-256: f99acef1e381c0504000b9354fb8b2db9d6ce7d9767561c4c95101fc6a5a051c