Malicious PDF — malware analysis report

Static analysis result for SHA-256 971588c4c612eabc…

MALICIOUS

PDF

74.8 KB Created: 2021-02-06 01:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 254652a595e72d078ddcf46fa0eb548e SHA-1: d4c3dd8c584464d4f7a68962f5e94b54adbdd677 SHA-256: 971588c4c612eabcaa8c033695e8a4ad352016bc794c2745ce5c6477f0e8fc03
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, contains keywords related to 'fishing report' and 'wkhtmltopdf', indicating a lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wb?keyword=lower%20flathead%20river%20fishing%20report PDF link annotation
    • https://cdn.sqhk.co/sidogorego/iidWpkl/pixel_car_racer_gtr_f1x_tune.pdfIn PDF document text
    • http://nubolutlion.xyz/58263330941k3q5h.pdfIn PDF document text
    • http://trujillostacoshop.com/fexeby3ld6.pdfIn PDF document text
    • http://epaytds.xyz/vufojoikqve.pdfIn PDF document text
    • http://meetplafond.xyz/fokagisekovusovudivpzrf.pdfIn PDF document text
    • http://kivudutamazawan.22web.org/invoice_template_australia_ato.pdfIn PDF document text
    • http://ionatr.fun/9660362640767rb3.pdfIn PDF document text
    • http://crysety.xyz/16406587666c6o1l.pdfIn PDF document text
    • http://stassikorskyi.com/wonudirinurif9m5d9.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/eghQ2ib/gasitorifukirirujuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zixadadafupeg.epizy.com/baseball_card_game_for_android.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/27584830214.pdfIn PDF document text
    • http://judejelalub.rf.gd/bb_pilipinas_2017_question_and_answer.pdfIn PDF document text
    • http://wefixewixe.rf.gd/fevaza.pdfIn PDF document text
    • http://potubavaziripek.epizy.com/peptic_ulcer_treatment_nice_guidelines.pdfIn PDF document text
    • http://mopawok.epizy.com/90501602054.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 5184 bytes
SHA-256: bba36cac853256161caf37550b2c59f1d20b7b6aabbbab25c47f52a8012fa60f
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10332 bytes
SHA-256: bdfd894e154cc52c30c01ffef00e4371d6d389cccf641a2f9db20fa3d207b91a
font_02_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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