Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7514be6b8aefb6…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 10:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee141fd1ff3d032b41f7cdf85e52d35f SHA-1: ae63277864c86e5d2e4c8ec2cd7ff89f00fdf2d1 SHA-256: 7a7514be6b8aefb686db24f6aab47bbb634c495d4a7c91e98a8abcb01a907063
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary suspicious URL being 'https://xajibur.ru/strik?utm_term=does+thomas+die+in+the+maze+runner'. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=does+thomas+die+in+the+maze+runner
    • http://kojazunupetip.mygamesonline.org/4137873075.pdf
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/848905.pdf
    • http://duvejiwuxikon.getenjoyment.net/zelesuwi.pdf
    • http://zutelotojenexop.getenjoyment.net/soxunarolusakovagadak.pdf
    • https://vevilatibivu.weebly.com/uploads/1/3/6/0/136082609/zaxibomuzozida.pdf
    • http://sunakijabe.sportsontheweb.net/panasonic_kx-t7731_phone.pdf
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/tewuso_zukawolezig_vadexo_bexemexuno.pdf
    • https://paniselodo.weebly.com/uploads/1/3/5/9/135969975/remudaxiru_dojesekejuxodi_vudip.pdf
    • http://fudazozotakaxal.mywebcommunity.org/shanghai_metro_map_2020.pdf
    • http://miromawetibikew.mywebcommunity.org/balantidium_coli_unam.pdf
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/putav_fogob_luzenol.pdf
    • https://tivavazo.weebly.com/uploads/1/3/5/3/135337759/feb2eeae0db8f43.pdf
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/gajobosapuwuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivamubug/gejala_pneumonia_adalah.pdf
    • https://s3.amazonaws.com/bojafazes/kefinukibaketorazagaratib.pdf
    • http://pabewuvuxaf.onlinewebshop.net/24640234578.pdf
    • https://s3.amazonaws.com/dudigonifu/stepstick_a4988_datasheet.pdf
    • https://s3.amazonaws.com/wemofodi/kitchenaid_stand_mixer_buy_canada.pdf
    • https://s3.amazonaws.com/batiku/software_testing_experienced_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/vavale/52279674716.pdf
    • https://s3.amazonaws.com/pukaridimupo/ketizavaf.pdf
    • http://sabixukavizom.myartsonline.com/abbyy_transformer_3._0_price.pdf
    • https://s3.amazonaws.com/bovenotojitowe/how_to_read_amana_serial_numbers.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_off0000fb16.bin
b77e13bf2625b44d6004680e2438371a0ef7dd6ef72450757f81c3f4b2c320cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 5080 bytes
font_01_sfnt_off00010c37.bin
aeb3ed46839a0404a70d5f51b1ccc67516d1575824752b96ee32527584da76b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 11120 bytes

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