Malicious PDF — malware analysis report

Static analysis result for SHA-256 53811738be87543d…

MALICIOUS

PDF

74.8 KB Created: 2021-03-19 09:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ca86e7af6e31b4b463c96368f3745bd8 SHA-1: a4a090609a058fc1daef9a7e7a7d14aa18203909 SHA-256: 53811738be87543dee5a91afcc4192fed5fc14b76c444200f127c897ea36ff11
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, specifically flagged as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Stephen King book font' and 'wkhtmltopdf', indicating a potential lure to disguise malicious intent.

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://fokemale.ru/strik?utm_term=stephen+king+book+font PDF link annotation
    • http://vutunema.mypressonline.com/figure_of_speech_list_with_definition_and_examples.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/fulukigokipija.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/M6gcxjj/lexinoziru.pdfIn PDF document text
    • http://monongzhlh.space/mavebepijimapejutera7md.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/xmaghgc/kijixivovon.pdfIn PDF document text
    • http://ita-yog.space/bullying_storyd0kbx.pdfIn PDF document text
    • http://clientbluebadge.com/what_episode_of_the_vampire_diaries_does_elena_and_damon_break_upfm7ia.pdfIn PDF document text
    • http://bandalet.club/hedge_fund_manager_reporting_requirementss22ys.pdfIn PDF document text
    • http://forkidsshop.online/sitadiwuredolefesagivg3axn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1a2e3f-1a2e-466a-ae65-b010f5d13584/norcold_refrigerator_recall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885bdcc4-7cda-4b85-942b-d1057c48d9bb/kitchenaid_artisan_5_qt._stand_mixer_-_ice_blue.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_18adc8812b8c405bb86e43340298f94f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8202cf-62c7-48ec-a54a-d3e14e1006f0/73891508728.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_04143839bee248718527ffdc7337eb36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vutame/dividing_fractions_word_problems_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/82015671570.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_4c360c89d1024a35bb722f82329c376d.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_d2e0b742cce842f994961fcc29c85458.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_2d318d47ca67409595c8aa50126a40b1.pdf?index=trueIn 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_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 4956 bytes
SHA-256: e704d5c92f4e21ed5973d7ea2014a8e43b8fa97d1c1cf80c50b5e683939b2b17
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 10284 bytes
SHA-256: 0b3b2a55e69b1f30607edb7fb84068b1fcfc05f4104847d32bab8257a182a090

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