Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5db1b804113fa6…

MALICIOUS

PDF

72.6 KB Created: 2021-03-19 23:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d435179f85a04174b469414f9d73beaa SHA-1: a6b86c880a2fa5a66e927ddeb8d5ae91332c93ce SHA-256: da5db1b804113fa6700fffab5531eb65b86cd74c0ac69a179ccdb272c4d09bcf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'jottigo.ru' and a keyword suggesting a lure related to 'Bethesda clinical oncology pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple disposable domains and link farms further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=bethesda+clinical+oncology+pdf PDF link annotation
    • http://pemizirevubel.mywebcommunity.org/kugibudujevebesok.pdfIn PDF document text
    • http://navaram.online/perfect_english_grammar_superlative_exercises4qtp8.pdfIn PDF document text
    • https://xanivumukil.weebly.com/uploads/1/3/1/8/131856382/ponofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_6044cadbbcc4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416923/normal_5ff9924c883be.pdfIn PDF document text
    • http://help-copyrightservice.xyz/287494771361xxcn.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/vugofokaki.pdfIn PDF document text
    • https://xutebaso.weebly.com/uploads/1/3/4/6/134631295/5b77b2f31c23f63.pdfIn PDF document text
    • http://foluxokifoni.22web.org/wajizakewafujatimizim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc7163f-d9b5-4ba8-b161-f6e1e9ca2d66/wuvorabijarobivid.pdfIn PDF document text
    • http://dubanexotokegel.myartsonline.com/uud_1945_hasil_amandemen_lengkap.pdfIn PDF document text
    • http://supabusoto.rf.gd/mawenuwadunas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d195b8ce-8bcd-45b3-a71e-14feb4de272b/samsung_washing_machine_repair_center_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0685bea-6004-4f62-8e43-5c19cf165162/velufolemavafoxomew.pdfIn PDF document text
    • http://sutazobizomobuz.rf.gd/husqvarna_445e_review.pdfIn PDF document text
    • http://wiwazez.epizy.com/cancer_de_estomago_causas.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/30865432056.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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 5472 bytes
SHA-256: 00aaccc1b18a6aa46406bcb780eec23f00166203337da742a6f2688d97087b56
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 10416 bytes
SHA-256: 7aa20862047248d44769cc924aa80680a9c6d66c6997ff51d200771820e9371c

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