Malicious PDF — malware analysis report

Static analysis result for SHA-256 600ff4ff0c1ba94d…

MALICIOUS

PDF

73.2 KB Created: 2021-02-22 23:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a9159ccf05e6a5e20bc28089aa2c2ad5 SHA-1: df7da9490ed69d7e408f91adfa8281960523c133 SHA-256: 600ff4ff0c1ba94da4acb9006b4268f86bf72a73e6fb7579d0db0f9fccfe2087
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs, with several pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=how+do+you+understand+income+statement PDF link annotation
    • http://metazoaapc.fun/sygic_gps_navigation_18.1.4_cracked_apkjbcor.pdfIn PDF document text
    • http://vodoroding.info/rakosetuwawponwr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465007/normal_5fc9c2b2e7e1e.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/givumukukavula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6022ca587991a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486045/normal_5fe33e20f2b26.pdfIn PDF document text
    • https://cdn.sqhk.co/gesimefav/digtrhh/joker_ringtone_2020_tik_tok.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/biwefifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fc64c3ea696e.pdfIn PDF document text
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/e1c62f316.pdfIn PDF document text
    • http://igbusinessabouthelp.com/redawemuvabipitifabefioxrom.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/igWhc7g/game_maker_studio_apk_download_android.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/d388c2dc.pdfIn PDF document text
    • http://canonsburglake.com/rudram_chamakam_lyrics_in_sanskritmlcp5.pdfIn PDF document text
    • https://cdn.sqhk.co/gigepiwej/h6BqFzB/crowd_cow_turkey.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/SmmhhwO/52258116386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5fd9fb2f23957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/unknown_facetime_call_answered_on_another_device.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/sliit_aptitude_test_past_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/kaplan_mcat_books_used.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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 5208 bytes
SHA-256: 27704b694958492eab1bceb60c4632b7b872299941c740a30fb580792c75a53e
font_01_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 11024 bytes
SHA-256: e502b2ef9ae287976bec8d9af2af67d86018f825e94675d17a144c7c9204f97d

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