Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6d8a76e3bcac6c…

MALICIOUS

PDF

92.8 KB Created: 2021-03-22 09:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9480fd0fc950e5c0417b2d45c3a440eb SHA-1: 88f30a75c27e9d55467d1940e6c08e6c4613aea4 SHA-256: 8c6d8a76e3bcac6cfc593bae4493912f84a8b378766e4df99fb44f0dcba9cbbc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or phishing. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass external link farm. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://leonvi.ru/wix?keyword=upgrade+complete+3+unblocked+google+sites
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/bojokiparafibaropa.pdf
    • http://kadabafomelu.66ghz.com/english_speaking_guide_in_japan.pdf
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/woxutegid.pdf
    • https://cdn.sqhk.co/besewixogiv/cBY6dig/pdf_of_marketing_management_class_12.pdf
    • https://metubunotawe.weebly.com/uploads/1/3/4/5/134595280/pirolajefu.pdf
    • https://cdn.sqhk.co/jerusuxelek/7dw1LFp/zijaririte.pdf
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/kexoduwimidek.pdf
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/9ba93d09.pdf
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/d4f2849dd041c1.pdf
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/xetilenorejapa.pdf
    • http://vabizosod.22web.org/95858158271.pdf
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/230251d8136.pdf
    • http://ziwixan.iblogger.org/jejavodesimaxejikabuv.pdf
    • https://cdn.sqhk.co/ruretibot/cheBuie/project_kickoff_meeting_template_xls.pdf
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/xubizoxibor-mafajasijekeri-polumasurod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xijalovelokolep/jujodonitojojamalowira.pdf
    • https://s3.amazonaws.com/jevedijadiki/54181169250.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/barcode_example_in_android.pdf
    • https://s3.amazonaws.com/bededuxotulapil/ftse_all_share_index_performance.pdf
    • http://zutagisite.epizy.com/safevasanizufegurotexuvo.pdf
    • http://filoroxesofe.rf.gd/irritable_bowel_syndrome_patient_education.pdf
    • https://s3.amazonaws.com/fefurorobumi/chinese_110_atv_carb_adjustment.pdf
    • https://s3.amazonaws.com/jusagi/vagidajixirotetamiten.pdf
    • https://s3.amazonaws.com/toguvaju/the_christmas_carol_2019_episode_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011316.bin
3696787e0e9764e37eedc6413a5371ca277dd5c49ba07a315780eaeae0cf85eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 5752 bytes
font_01_sfnt_off00012693.bin
d03a46fe3fab44524e629d20e348a64bb1db1b0af447b5b5da24fe2533ee9664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12693 10612 bytes
font_02_sfnt_off00014b2b.bin
4adf8152f5991e4b99418e0605d67ce20dc056126ab3e8e9448fe05cae71c3cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2B 17520 bytes

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