Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5992246fc8104d…

MALICIOUS

PDF

85.0 KB Created: 2021-04-05 17:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afd80c6b94f8e9eb1020f5c4355b469d SHA-1: b8e64bbea4ca7acded902b16184e799fc5181399 SHA-256: ba5992246fc8104db04ff45e6d095556655b8fb8719ac9392ca81f8c4f4bcfe0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a large number of embedded external links, forming a link farm, with the primary URL being a search query for 'brainpop periodic table of elements answer key'. The extensive use of external links suggests an attempt to redirect users to potentially malicious websites for traffic generation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=brainpop+periodic+table+of+elements+answer+key
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/sakutaxede-saxodupefebe-nolowoduviwepa-difozinopax.pdf
    • https://cdn.sqhk.co/wekaradukuve/ja1mgeX/mujakenumomavojumu.pdf
    • https://cdn.sqhk.co/foseziwate/93Nsh7T/kakimixu.pdf
    • https://cdn.sqhk.co/jupozaregu/dgJukHk/background_video_recorder_2019.pdf
    • https://nogurutofuxuj.weebly.com/uploads/1/3/4/5/134525281/pebigoguxegitoj.pdf
    • https://cdn-cms.f-static.net/uploads/4484812/normal_606a6c6856557.pdf
    • https://puzileto.weebly.com/uploads/1/3/4/6/134674509/wudujunimane_maxoxezixok.pdf
    • https://cdn.sqhk.co/befozaxulot/hjfppgj/xawutukeweraz.pdf
    • https://cdn.sqhk.co/bitowiso/2hfzjh9/nuclear_arms_race_cold_war_primary_sources.pdf
    • https://cdn.sqhk.co/filovixedalu/hawgcaf/download_server_info_minecraft_premium.pdf
    • https://cdn.sqhk.co/kelopifagisu/jcjelWt/59672136359.pdf
    • http://finansi-7.online/patient_admission_form_templateiz83r.pdf
    • https://cdn-cms.f-static.net/uploads/4408881/normal_6065c70487721.pdf
    • http://upgrade4me.com/740613410894vi78.pdf
    • https://cdn-cms.f-static.net/uploads/4379612/normal_6038ce6cc09c9.pdf
    • https://static.s123-cdn-static.com/uploads/4407788/normal_5ff4d1c6b034d.pdf
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fe25e45994bf.pdf
    • https://cdn.sqhk.co/xidupesijij/fNOgfjd/94662312363.pdf
    • https://cdn-cms.f-static.net/uploads/4374360/normal_605dded898bf1.pdf
    • https://lifunakejeka.weebly.com/uploads/1/3/4/3/134358873/peliboxarug.pdf
    • https://cdn.sqhk.co/tixuniwe/dgiHuhj/87739394202.pdf
    • https://cdn.sqhk.co/rufopunuk/l5mDifo/bluffton_university_athletic_facilities.pdf
    • https://cdn-cms.f-static.net/uploads/4481695/normal_603f35914c70f.pdf
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd63b1406d79.pdf
    • http://artelamp.store/gimufozododererunavovisogku562.pdf
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5fdcb86629e34.pdf
    • http://priz24.site/can_my_tv_remote_control_my_soundbarfgl8f.pdf
    • https://cdn-cms.f-static.net/uploads/4387566/normal_6065d61e50862.pdf
    • http://drnextact.xyz/what_is_community_rehabilitation_centeritr8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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_off000100e9.bin
e05597c349a7b4a4082e250a6a4398f453b0109cf663a921c18d93990946c677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 5536 bytes
font_01_sfnt_off000113ad.bin
1ec6bf93924286252a8723946b37517def82c789e2c4e106121e539412379e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 10484 bytes
font_02_sfnt_off00013783.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13783 4324 bytes

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