Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbbfda4d4c7ebb0…

MALICIOUS

PDF

83.4 KB Created: 2021-03-22 20:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe1ffdc11648c5d5b7d956b4eaaf15c1 SHA-1: 65fdc87e5f22e3628a78160838246b99e989502b SHA-256: 3cbbfda4d4c7ebb0cbcfa8575f125df9282f2b181f0997c89469d9734bd5ea80
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a prominent one pointing to 'resalured.ru', suggesting it's used to redirect users to a malicious site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://resalured.ru/aws?utm_term=motor+speech+disorders+duffy+3rd+edition
    • https://cdn-cms.f-static.net/uploads/4403270/normal_601319a5aafdf.pdf
    • https://cdn.sqhk.co/mipekakiri/02JjjUV/crash_dive_mod_apk.pdf
    • https://cdn.sqhk.co/bokapapukopa/aifSFXG/pemavetixabegitazevur.pdf
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5ffa077a5a049.pdf
    • https://cdn.sqhk.co/jowapezo/0JGHzBn/vumetopixozuzode.pdf
    • http://jofarofuwudeveb.66ghz.com/45146557880.pdf
    • http://laregazobo.22web.org/56059713242.pdf
    • http://bavewemelemare.iblogger.org/oxford_textbook_of_interventional_cardiology.pdf
    • https://cdn.sqhk.co/guletema/igiiejj/pepozolubaxifedodevaj.pdf
    • https://static.s123-cdn-static.com/uploads/4453328/normal_5ff9fd1004f29.pdf
    • https://cdn.sqhk.co/vipikunowi/tjdggQm/among_us_wallpaper.pdf
    • http://taxafig.66ghz.com/moment_duration_format_trim.pdf
    • https://cdn-cms.f-static.net/uploads/4414153/normal_603985d3ae530.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ruxuwidoke.epizy.com/vitunezavawulebuletezaras.pdf
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_b7e603d6b55d4b2ab1a0838c85b00488.pdf?index=true
    • http://wadatenut.rf.gd/wicked_gregory_maguire_summary.pdf
    • https://s3.amazonaws.com/wizidimawag/macmillan_english_grammar_in_context_advanced_answers.pdf
    • http://batalogafoma.epizy.com/gauhati_university_bsc_botany_major_syllabus.pdf
    • https://s3.amazonaws.com/joterige/british_special_air_service_motto.pdf
    • http://jiviwuruxaboku.epizy.com/push_message_android_example.pdf
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_814c3e9604a14611a1d7fafcb3e8bbd2.pdf?index=true
    • http://nogomazarem.epizy.com/drama_cheer_up_sub_indo_drakorindo.pdf
    • https://s3.amazonaws.com/vufupu/flow_of_energy_and_matter_in_ecosystems_ppt.pdf
    • https://s3.amazonaws.com/zomuzigo/free_isometric_dot_paper.pdf
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_9fc7b1bc42a14cbab1661c25a29450e6.pdf?index=true
    • http://soxosodazafu.epizy.com/50166187866.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e3.bin
8479bedd61abe990168c78346c09c4146302d81e4d01af1f68cb811f266defc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 5156 bytes
font_01_sfnt_off0000f780.bin
948c537f2a02d92806a79cabf33639875cd22084f3378a4313e83e9994ed558e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 10740 bytes
font_02_sfnt_off00011c59.bin
462d13bd97d7d9b38b38dac4ddb889f891d4742debcdf3bbf084b15d68e01d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 16084 bytes
font_03_sfnt_off0001310f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1310F 4324 bytes

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