Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13ab382680effbc…

MALICIOUS

PDF

95.8 KB Created: 2021-06-02 19:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c96066cb8a474bf30cf79b4edf91205 SHA-1: d43f640ce25cdef5448a03a4871042cd49c2b342 SHA-256: b13ab382680effbc478e362bb0a41e2bca18c4a84bc69fc3ea793fa627bf3724
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/pbw?utm_term=vizontele+tuuba+izle+full+hd+tek+par%25C3%25A7a+720p
    • https://static.s123-cdn-static.com/uploads/4453729/normal_5ff313e0b69e4.pdf
    • https://cdn-cms.f-static.net/uploads/4454045/normal_603f37e44c3d7.pdf
    • https://cdn-cms.f-static.net/uploads/4366402/normal_601525b386669.pdf
    • https://wekopigigosem.weebly.com/uploads/1/3/4/5/134503853/sizelufugi-robejexa-kefezigot-jesumi.pdf
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fecc98aac7c9.pdf
    • https://cdn-cms.f-static.net/uploads/4485704/normal_604cfc2a31be7.pdf
    • https://cdn-cms.f-static.net/uploads/4455374/normal_601b2a5040404.pdf
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/c1ba424636af.pdf
    • https://static.s123-cdn-static.com/uploads/4413983/normal_600013085999f.pdf
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/1144125.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zezimin.pbworks.com/f/when_did_all_i_want_for_christmas_is_you_come_out.pdf
    • http://siruzosu.pbworks.com/w/file/fetch/144446325/34931637059.pdf
    • http://sazupamufode.pbworks.com/f/hungry_shark_evolution_mod_apk_android_oyun_club.pdf
    • http://sewafebi.pbworks.com/f/biochemical_evidence_for_evolution_worksheet_answers.pdf
    • http://fipivuzigoge.pbworks.com/f/download_monster_legends_mod_apk_new_version.pdf
    • http://sozakuvepar.pbworks.com/w/file/fetch/144507030/30980501361.pdf
    • http://palixazoke.pbworks.com/f/rubitasibamitoge.pdf
    • http://nugewus.pbworks.com/f/a_brief_history_of_modern_psychology_benjamin.pdf
    • http://jolunatimavu.pbworks.com/w/file/fetch/144504549/how_to_conduct_a_swot_analysis_examples_strategies_and_templates.pdf
    • http://magobok.pbworks.com/w/file/fetch/144497316/praxis_test_5354_study_guides.pdf
    • http://luwapoveduvi.pbworks.com/f/21072436905.pdf
    • http://zufogopojut.pbworks.com/f/3124967482.pdf
    • http://fepewuwakow.pbworks.com/f/gemebe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124b5.bin
ee1304ea3a843b8c6eddf236d18eca31786cc08b4d12c904f2f838578a8cebff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 3140 bytes
font_01_sfnt_off00012fd9.bin
c32f0c7cbac689de3a6237280459a16f096874c5c3f614d1881e01e8aa0de28c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 5708 bytes
font_02_sfnt_off00014349.bin
c1e92774b50fa54614aae9029af9462477a44bc39dafc0614fed6ed540e34ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14349 14244 bytes

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