Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36d4fd58b1e21c6…

MALICIOUS

PDF

139.3 KB Created: 2021-02-04 07:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 257daa37543ed8c9025e99dd92f58740 SHA-1: 1053856a0166886f2a8394dc19b58f3f114c479e SHA-256: b36d4fd58b1e21c6b08111e01e8198fee987d217b90c6ad82053a3f7664df63a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a distribution mechanism for malicious content. The document body, though heavily obfuscated, contains metadata related to a fishing report, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/aws?utm_term=eckelson+lake+nd+fishing+report PDF link annotation
    • https://cdn.sqhk.co/vozevadijut/iOcpjhd/69407012195.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/cjjgchb/natedoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5ff666aa7e634.pdfIn PDF document text
    • http://gakivako.iblogger.org/circling_adverbs_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/fohjchc/dc_comics_villains_teams.pdfIn PDF document text
    • https://cdn.sqhk.co/xujutitula/qaJjaje/live_in_five_pro_apk_firestick_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5fd9db459f26c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5fd6a63247319.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/hhcibKJ/zombie_sniper_shooter_3d_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482208/normal_5fef9857184ef.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/8geicBp/mikitapimofigirab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosukijabadizi.epizy.com/20449697636.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/ripotemexogira.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/fanizopekipogewog.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/rajaba.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/sonnet_75_edmund_spenser_questions_and_answers.pdfIn PDF document text
    • http://tugefewose.rf.gd/alcanos_alquenos_y_alquinos_ejemplos.pdfIn PDF document text
    • http://tawatibajat.rf.gd/configura_cet_designer.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/hotspot_wifi_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D03D 5436 bytes
SHA-256: 3f4dc6ac23aabdb5d847a8adf5e81a465708a1cd04ba82dde57aab2d7e045597
font_01_sfnt_off0001e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2C6 11724 bytes
SHA-256: b4d579304d0fcabebc311b2cd8bb60057d1d8cf5a889f5e84f7bff6fd5175455
font_02_sfnt_off00020acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20ACF 16060 bytes
SHA-256: 5b45d8957cdd618c0f157c507058aef1810e6158bb3d1abf257796d6008f54d1

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