Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5394886d8611b06…

MALICIOUS

PDF

85.8 KB Created: 2021-05-03 23:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d05afc63c2e8e837b9faa84d5cf07cd SHA-1: 7751b47c77a62160bd9bb03b2ef364d007d9bede SHA-256: e5394886d8611b06f8e5c4dfd40e5b816262cbce354ae170655a4ad25ee4b520
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm or SEO manipulation scheme. ClamAV and ML classifiers indicate malicious content, specifically identified as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to redirect the user to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=anglo+saxon+riddle+examples
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5ff33a3c0611d.pdf
    • https://static.s123-cdn-static.com/uploads/4390350/normal_6000176689af9.pdf
    • https://cdn-cms.f-static.net/uploads/4386333/normal_602620e19fe0e.pdf
    • https://static.s123-cdn-static.com/uploads/4379961/normal_5fc9928d7eef7.pdf
    • http://lawexape.mygamesonline.org/rixijojarotowejotoju.pdf
    • http://suraneb.scienceontheweb.net/52238606374.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/tosevud/how_to_turn_off_the_seatbelt_alarm.pdf
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_27ab096b3fbe4b2da551cee812751624.pdf?index=true
    • http://vegubom.atwebpages.com/13710877136.pdf
    • https://s3.amazonaws.com/nitirew/vewonuge.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_4e8903be48094d018d386795b6a79b8d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d8d9571c-6cbb-4fb8-b06e-97fde60431fa/no_fear_shakespeare_king_lear_act_5_scene_3.pdf
    • https://s3.amazonaws.com/rodakarugupoko/koginekuworisid.pdf
    • https://s3.amazonaws.com/ziwuvijevo/zenusagomamanoxidufutuf.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_101d287f2b3846c29fdc322ef2515048.pdf?index=true
    • https://s3.amazonaws.com/bejokazemur/wexefakaponadobupudumi.pdf
    • https://uploads.strikinglycdn.com/files/d56b3bde-4209-4a50-9b32-38b020006e27/do_lab_made_diamonds_hold_their_value.pdf
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_867d8714af8c4bceb36e0e9a16459913.pdf?index=true
    • https://s3.amazonaws.com/lemerisinivum/5629787268.pdf
    • https://uploads.strikinglycdn.com/files/2f205567-10b2-4889-9b96-ee27d995c502/the_5th_wave_2_trailer_2019.pdf
    • https://s3.amazonaws.com/xirixepo/bygone_days_sheet_music.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://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead5.bin
8a1b8e27bff41ad0471a51f7d5694f8e52a11c26851d81aa0ce8839151d7a65c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 5336 bytes
font_01_sfnt_off0000fce3.bin
69ef156bf5e94b7106f84927f627339f90f0e7dff59f55957ac658c97cc82dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 6600 bytes
font_02_sfnt_off00010e6e.bin
92281ba8710cb70338188f88a7431db3a3a2f7de73d973164abc8e830ef22d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 11000 bytes
font_03_sfnt_off00013414.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 16204 bytes

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