Malicious PDF — malware analysis report

Static analysis result for SHA-256 554a2b682f5c5e8c…

MALICIOUS

PDF

71.5 KB Created: 2021-04-01 15:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b40eaa55e2e11f6062f208f91ffc9aac SHA-1: aa728541c805197fc1dbfac99ccf7016b28c6e9e SHA-256: 554a2b682f5c5e8c231a86a0bbdd4ec11985c60842fcbc32e332070608ca3296
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs, such as 'https://zajinet.ru/wix?keyword=basketball+play+sheets+with+notes+pdf', are used as lures to entice users to click through.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=basketball+play+sheets+with+notes+pdf
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/jokosufonem-dumem-pazas-nutujiwafe.pdf
    • https://cdn.sqhk.co/gadukupuwe/fjfxfic/28757865120.pdf
    • https://cdn.sqhk.co/zanemulazif/osja4UD/xukepotumeraxa.pdf
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/dfed5db2ccf912.pdf
    • https://naxaletuzo.weebly.com/uploads/1/3/4/5/134508506/buwama-tedur-dunavuvutopi-tusidofam.pdf
    • https://cdn.sqhk.co/tisorobew/dhbmchb/city_car_driving_mods_2020.pdf
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/bikeki_janevisifidaku.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/2f380b0.pdf
    • http://nafotasu.22web.org/4897506306.pdf
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/fadizavuz-fefixajedu.pdf
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/bawerodumumum_roxugip_sumujagu.pdf
    • https://cdn.sqhk.co/livaxipovage/w8idjhi/gebowi.pdf
    • https://morupataniseb.weebly.com/uploads/1/3/4/5/134502176/1523704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zibenoroduzuw/lizikezi.pdf
    • https://s3.amazonaws.com/legesiliv/mosut.pdf
    • https://uploads.strikinglycdn.com/files/dc8763a7-4574-4b40-849b-909ffd4756fe/perspective_made_easy_ernest_norling.pdf
    • http://wesukaxibofawu.epizy.com/onn_universal_remote_code_for_vizio_tv.pdf
    • https://s3.amazonaws.com/rodigapigeta/21091719796.pdf
    • https://s3.amazonaws.com/fidefofudi/java_jdk_macos.pdf
    • https://uploads.strikinglycdn.com/files/a4aeaced-be13-4bd3-8f0c-d3e9526834cf/aha_pals_provider_manual_free_download.pdf
    • https://s3.amazonaws.com/negonanopix/top_leadership_interview_questions_and_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96e.bin
017708775c926d91c7f07521c149202d06c411ac8fd51306bc8c947ed7800b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 5480 bytes
font_01_sfnt_off0000ec29.bin
c28f9db533fad5b70eb528647c9715b55c2b3300592b7cc2a105ed5bccf80f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 10568 bytes

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