Malicious PDF — malware analysis report

Static analysis result for SHA-256 d777fb3736e091bb…

MALICIOUS

PDF

99.7 KB Created: 2021-02-22 04:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cc31582d32492330c5bdf657627d14df SHA-1: 04e0a28c1646523734c1a0ae8130ab6bfe6006c3 SHA-256: d777fb3736e091bbe33517dc0623a8f842cef51dd47db0959a43434a0dfa34a6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to educational content, likely a lure. No scripts were extracted, but the presence of numerous external URLs indicates a high likelihood of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/wix?keyword=distributive+property+and+combining+like+terms+worksheet+6th+grade PDF link annotation
    • https://cdn.sqhk.co/manowipete/j3A5qje/snapchat_icon_black_and_yellow.pdfIn PDF document text
    • http://fesavuxofogegil.iblogger.org/batla_house_movie_filmyhit.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/Wojh5ia/guvus.pdfIn PDF document text
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/4465630.pdfIn PDF document text
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/buvuteporumib_buveg_mofixodu_derete.pdfIn PDF document text
    • http://muliruno.22web.org/11003802077.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/dZiiVic/nilizivudamopu.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/jhgdtjh/viridian_green_oil_paint.pdfIn PDF document text
    • http://kumujobu.iblogger.org/43759413488.pdfIn PDF document text
    • https://kexufufebir.weebly.com/uploads/1/3/2/8/132814170/varovorutemoxa_ligilumevilaxu_vawitofudu_mutifof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • https://s3.amazonaws.com/takurugilij/71677744359.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/29355117972.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/omlet_arcade_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/arthrex_ankle_fracture_system.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/78714083760.pdfIn PDF document text
    • http://koselogajigikev.epizy.com/damaged_2014_full_movie.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/73466631457.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/sgs_galson_chain_of_custody.pdfIn PDF document text
    • http://magivuxitafexox.rf.gd/87297040624.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 3288 bytes
SHA-256: f0b27b1c6ece5416af304e40d977d0fb6caa344bbe5baaa4e8b54a4641414978
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 6100 bytes
SHA-256: abce44c6f3b50b8319dd42d4abbe7ecdd9764bd7cfdb100d7ceed874802d657c
font_02_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 20612 bytes
SHA-256: 1f3dad8d0b515824dea26c1b26b422a9396eaa3dae4b255f2a602eb88aed1a03
font_03_sfnt_off00013a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9E 14012 bytes
SHA-256: 9744bd545b1cae7369a2cf9a8e46e4b09137eb58149840a6314355d33b713c1d
font_04_sfnt_off000168b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B0 16548 bytes
SHA-256: b9b99a0556f9292b2a1091125807f89eb32ccc6b61d579e2083f637fc9247e7b

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