Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38eab2ca7cd636f…

MALICIOUS

PDF

78.9 KB Created: 2021-03-19 14:10:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86845154161ff77e596dfb36be4810ae SHA-1: 506e28d3bf0bb8f162ae101e61d65232ea20b0b8 SHA-256: c38eab2ca7cd636f4ea9bbecbfa585414489070c0aa67a8df34bcf1291dec275
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 in SEO link farms to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'vocabulary workshop answers', directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/wix?keyword=vocabulary+workshop+level+b+unit+11+answers
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5fff0f60bdbe0.pdf
    • https://cdn.sqhk.co/futevanu/hdjdghg/rocketman_song_origin.pdf
    • https://cdn.sqhk.co/retakabif/iOhbyhg/wogojuvomerovitu.pdf
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5fda699d5c514.pdf
    • https://cdn-cms.f-static.net/uploads/4409610/normal_602e3bd9bd3ba.pdf
    • https://vagomonezupu.weebly.com/uploads/1/3/4/4/134403629/matamipatakeruwume.pdf
    • https://pepakulal.weebly.com/uploads/1/3/4/8/134885681/4843000.pdf
    • https://cdn.sqhk.co/miwataxanis/cf2jgha/wings_of_fire_books_9-_13_box_set.pdf
    • https://cdn-cms.f-static.net/uploads/4482860/normal_60157a10ddb8b.pdf
    • https://static.s123-cdn-static.com/uploads/4365636/normal_60021fb117aa9.pdf
    • https://cdn.sqhk.co/wugotiparo/Uidhgcz/90771474982.pdf
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdf
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5fe5b47bde6dc.pdf
    • https://cdn.sqhk.co/moxelutedoje/hxgdP3z/best_music_identifier_app.pdf
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/5460339.pdf
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/4784002.pdf
    • https://cdn-cms.f-static.net/uploads/4412378/normal_60207b2797d8d.pdf
    • https://cdn.sqhk.co/daribugubive/hTjghge/vosufusonidobidida.pdf
    • https://cdn.sqhk.co/vudararemane/jwjgiio/play_fruit_sugar_splash.pdf
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/poligikodinovux-gekowi-potowubadonore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zusozokag.epizy.com/cambios_biologicos_del_adulto_mayor.pdf
    • http://wakagita.rf.gd/bing_wallpapers_free.pdf
    • http://ponuruv.rf.gd/jonodisusuregifiturum.pdf
    • http://wagadepepixapu.epizy.com/96782802392.pdf
    • http://mifijikamipupu.epizy.com/venokimesotabogawabi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2d.bin
68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 2900 bytes
font_01_sfnt_off0000f670.bin
6bd6b68098304a69e4b8a9811946cd769729f4def5e822b26273e8f6c9289e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 5496 bytes
font_02_sfnt_off0001093a.bin
a0481941fcecdb63906378fbb5ea8c0eed2bdf0f0595a78db2bec33ff7d78d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 10004 bytes

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