Malicious PDF — malware analysis report

Static analysis result for SHA-256 46595bac7692519f…

MALICIOUS

PDF

75.4 KB Created: 2021-04-01 15:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af53bc2c90e719845d1108e1f747069 SHA-1: 7d6000b535f996e58a48379ea46c7d7f3e43f2ba SHA-256: 46595bac7692519f7518a3b59f11614210dc734b67be815ad336e279cca8f397
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, suggests a lure related to 'quiz answers', aligning with the PDF_SEO_LINK_FARM heuristic which points to a large number of generated PDF links.

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-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://soxebez.ru/wix?keyword=reversible+reactions+and+equilibrium+quiz+answers
    • https://cdn.sqhk.co/pidodalatip/eW0fMjh/31296136612.pdf
    • https://junezafebu.weebly.com/uploads/1/3/0/8/130874287/13b0c1eeb.pdf
    • http://zekifafeter.scienceontheweb.net/54366332290.pdf
    • http://jefijunanupe.sportsontheweb.net/16341362361.pdf
    • http://biomanix.best/encuentros_maravillosos_answers84t6p.pdf
    • http://instapriz.site/viwanijzhbf.pdf
    • http://miromawetibikew.mywebcommunity.org/fagunimudur.pdf
    • https://gukujevanedin.weebly.com/uploads/1/3/5/3/135344472/9095627.pdf
    • http://mydenverneighborhoods.com/just_mercy_book_amazon6knen.pdf
    • http://bivaxosufuxibo.mygamesonline.org/robotica_educativa_con_arduino.pdf
    • https://cdn.sqhk.co/jesisuvov/sjdpFnD/vorolazuropomiripusu.pdf
    • https://cdn.sqhk.co/wadebekop/heJjbic/64051681348.pdf
    • https://cdn.sqhk.co/forinabam/ji3jihd/87813342396.pdf
    • https://gabejudunutulan.weebly.com/uploads/1/3/4/8/134887900/2309e.pdf
    • http://dnepr24.info/88994532506b9luv.pdf
    • https://votetofovuwov.weebly.com/uploads/1/3/4/9/134901863/zuzusobejimis.pdf
    • https://cdn.sqhk.co/fovomesit/NujdWha/mini_golf_3d_3_unblocked.pdf
    • https://cdn.sqhk.co/kelulegawi/gegiajc/artificial_intelligence_robot_sophia.pdf
    • https://cdn.sqhk.co/dejenuluzew/bhhjgja/binofojezivunelorasis.pdf
    • http://letgtma.bid/vitamix_5200_blender_professional-gradef35a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rufeluvogoweva.epizy.com/chapter_7._1_ions_worksheet_answers.pdf
    • http://kidiwafupilisu.rf.gd/dieta_cetognica_cclica.pdf
    • http://miwusox.rf.gd/sololearn_pro_apk.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_off0000e67e.bin
8eed9a8ea8d8aa6cf6b8579bc82cf7e734c1441d1df37549f0a54d60513d6a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 5560 bytes
font_01_sfnt_off0000f96b.bin
d1f536520d81c918cd18dca5148b539412ed901d0610f6af3ddaf611e8d41640		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 10800 bytes

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