Malicious PDF — malware analysis report

Static analysis result for SHA-256 b766303eb2aa1ae0…

MALICIOUS

PDF

75.4 KB Created: 2021-02-25 02:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c73a367a8be0c92e8df4ee52e178c506 SHA-1: 422ed892b542043450364f111dc26b3cf92309c9 SHA-256: b766303eb2aa1ae02da5678186088708894d14c2545790a216b9bb9c7dfe6308
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, and contains numerous external URIs pointing to various domains, many of which are flagged as disposable hosting. The document body, though heavily obfuscated, suggests a lure related to drawing, which is likely a pretext to direct users to malicious sites.

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/aws?utm_term=how+to+draw+cartoon+noses+front+view PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475992/normal_6001810cd4026.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/ehjfgmh/best_nba_3pt_shooters_2019.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/ronugemopagozitim.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/paneroworunopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494160/normal_60018f460f9a3.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/pggQn4L/balance_ball_3d_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/FyhhVGF/hungry_shark_world_pc_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/hticidx/72964452657.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/wozowuledij/ashina_elite_guide.pdfIn PDF document text
    • http://mulexotuvatago.epizy.com/26423664770.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/rinotovawidevaroxajerinut.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/62851159309.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/microbiology_unknown_bacteria_lab_report.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/celestron_astromaster_114eq_how_to_use.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/soleus_air_70_pint_dehumidifier_not_working.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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 5096 bytes
SHA-256: d508127ceffac7d65f6c2115b3d83f02683597e15ba800d28811188809082ed9
font_01_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 10364 bytes
SHA-256: 76fc2f8e9081fa8559f71020655daf282ac4d7bd779ac2ab8eb427bdbec9cde6

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