Malicious PDF — malware analysis report

Static analysis result for SHA-256 87506e32eaaf9c62…

MALICIOUS

PDF

77.3 KB Created: 2021-03-07 10:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ad1136936a17dad75e85801e7be60a2 SHA-1: 2488c567f93c4a1e0f118317b987c9f621fb388f SHA-256: 87506e32eaaf9c6254a9e5bfa2943911aa805b9d67782e262489273e7abd27d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The embedded URL 'https://nipisod.ru/wix?keyword=world+3+castle+star+coins+switch' is likely part of the initial lure or a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/wix?keyword=world+3+castle+star+coins+switch
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/37b66c1.pdf
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/3459485.pdf
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/nomalejofidu-xujobawonadiruv-rumaloravite-ginunoram.pdf
    • http://zovofuti.mygamesonline.org/how_to_make_dunkin_donuts_blueberry_coffee.pdf
    • https://zaronubiguxade.weebly.com/uploads/1/3/4/6/134685024/18372444881cc04.pdf
    • https://dovomarolod.weebly.com/uploads/1/3/0/9/130969455/6113963.pdf
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/3000960.pdf
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/pitatumavemufawabe.pdf
    • http://gosoxegekiri.mywebcommunity.org/scramble_for_africa_simulation_ppt.pdf
    • http://xufelaketodo.getenjoyment.net/usps_domestic_mail_calculator.pdf
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/fojokafanataret.pdf
    • https://cdn.sqhk.co/mabisurud/hojfQhp/running_water_sound_behind_toilet.pdf
    • https://cdn.sqhk.co/zekafomaze/evBIihz/53320362156.pdf
    • http://nopotaz.medianewsonline.com/aoc_i2757fh_27_inch_monitor.pdf
    • https://cdn.sqhk.co/sepunaro/geifij3/chess_rap_battle.pdf
    • https://cdn.sqhk.co/jaxogubajo/gfifmja/battery_tender_800_automatic.pdf
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/eef34c69dcf2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/guwutivupudutu/avg_pro_apk_6._16._4.pdf
    • https://s3.amazonaws.com/donarepemi/tijamaluzutujedojimexigen.pdf
    • https://s3.amazonaws.com/likadojivivofu/ableton_live_intro_free_full_version.pdf
    • https://s3.amazonaws.com/vuforewebub/brother_mfc-6490_print_head_replacement.pdf
    • https://s3.amazonaws.com/falufusu/when_a_single_man_buys_a_house.pdf
    • https://s3.amazonaws.com/megulu/red_bruce_willis_movie_free.pdf
    • https://s3.amazonaws.com/jalasilunaz/12470388608.pdf
    • http://jokubamobivavum.onlinewebshop.net/tibikatugebaw.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_off0000f230.bin
fa61e22190a311b6436820eee6b185f58278034eda21a634384d2907128ac3bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 5296 bytes
font_01_sfnt_off00010444.bin
56fca4bc1e856e51dd1dcfc63244b175fec5a64bbc787ad13f001195fa76a499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 10300 bytes

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