Malicious PDF — malware analysis report

Static analysis result for SHA-256 67eefaef4d3cc58b…

MALICIOUS

PDF

66.9 KB Created: 2021-01-30 06:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d96a15d5d3c69c79651fd5fe1a5ac09 SHA-1: 82d58a00d71a93a40f99a2c138754c636f9cc415 SHA-256: 67eefaef4d3cc58b849e5df4d85c047d53eda804cfc86175e1658649d1a527dd
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful 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://maypoin.ru/wb?keyword=aio%20launcher%20premium PDF link annotation
    • http://septiki-rf.website/duck_hunting_season_2020_illinoisd2tw1.pdfIn PDF document text
    • http://fsbsiod.com/breezer_uptown_8_owners_manual031pg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470222/normal_600ebf04cba2d.pdfIn PDF document text
    • http://leafester.online/kabeguim01o.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/baxuwuranan.pdfIn PDF document text
    • http://copyrightsupport-ig.com/avaya_9508_quick_reference_guideimx5q.pdfIn PDF document text
    • http://top-odejda.com/jofatit0x4e.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/biwosebez_sawobu.pdfIn PDF document text
    • http://my-favshopd.online/negligee_love_stories_apk_androiddjc5o.pdfIn PDF document text
    • http://lightly.store/number_names_french_worksheet08wxt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valamujunitun.epizy.com/departure_tv_show_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/4081536618.pdfIn PDF document text
    • http://pikididubemet.epizy.com/42680467773.pdfIn PDF document text
    • http://raduniti.epizy.com/acceleration_due_to_gravity_lab_report_discussion.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_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 4984 bytes
SHA-256: d37ea079eae392aca4dd8736f21f1c500629fa483802741691c2b92fb70267c6
font_01_sfnt_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 10880 bytes
SHA-256: f5ccaee4ccf8ed21af60fe55a6fe3da1d41d7db7bace58f0bbff3dc5fb40e67e

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