Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33513ce238b4f27…

MALICIOUS

PDF

76.6 KB Created: 2021-05-10 23:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c3f0f9113c7f2bd7b0cf5e6f402d4c4a SHA-1: aa80fbcca8c9eb2b401b609de5e66b358c90113b SHA-256: f33513ce238b4f2715cf8e39371a0f1ce2b9677e1e9849ab4ef721974cba89c6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'big fish grill wilmington de reservations', suggesting a lure to trick users into visiting the malicious site.

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://ponafet.ru/strik?utm_term=big+fish+grill+wilmington+de+reservations PDF link annotation
    • https://cdn.sqhk.co/ramazunor/svxGUjj/28131863434.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/jahe0ii/dakibinopikudose.pdfIn PDF document text
    • http://radanukodufam.22web.org/7699896483.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/jggiojj/puzzle_bobble_online_2_player.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxifobiro/hexohjm/median_section_of_the_eye_answers.pdfIn PDF document text
    • http://fupomogusi.22web.org/spotify_premium_ios_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/Jifjdia/71189442531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490929/normal_6044938a41f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465000/normal_601208dca2421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5feed2952333a.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/iggWkkr/ball_balance_game_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/fjjgdhf/widanowimesuwenulejoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_6050f34728563.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekejuf.atwebpages.com/introductory_mathematical_analysis_12th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ef63db-98a0-4002-be57-943977d86983/where_to_buy_panasonic_rice_cooker.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/8756370413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf32ee3-28b8-4ff7-a0ce-6bb6055e4b6d/alexander_the_great_empire_map_modern.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_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 5520 bytes
SHA-256: 664ca78fa23bcefdcba0c441997a4a58dc468e7446dbb239d1f34609bb8eb703
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 11132 bytes
SHA-256: 22edb07b213742ab68b14d6ebc08e2c5fb5321fdc54bf08edca880fbae41083f

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