Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab16c251d8e54ad2…

MALICIOUS

PDF

104.7 KB Created: 2021-04-01 01:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a45a42ee91974b7b4d89068e8be2539 SHA-1: 559dda7e292db2279b1f9c09ec67075abf5afb94 SHA-256: ab16c251d8e54ad2a7a1767bd92ace4704c523aaf0bc4e47a375e082395d2d77
164 Risk Score

Malware Insights

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

This PDF exhibits characteristics of SEO spam or phishing by linking to numerous external PDFs, including one with a lure related to voicemail instructions. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to drive traffic to malicious sites or distribute further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=primary+assistant+teacher+result+2020+pdf+download
    • https://cdn-cms.f-static.net/uploads/4408704/normal_603c423dcb360.pdf
    • http://jeseselanus.scienceontheweb.net/39526594136.pdf
    • https://static.s123-cdn-static.com/uploads/4456119/normal_5feeb9c5b68bb.pdf
    • http://tejowigasinafu.getenjoyment.net/99373479856.pdf
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fde3ac45d169.pdf
    • https://cdn-cms.f-static.net/uploads/4489838/normal_6041bb0372f8f.pdf
    • http://wejuveziwep.mypressonline.com/come_on_eileen_violin_sheet_music.pdf
    • http://fidafevemikiwe.mywebcommunity.org/19252837518.pdf
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5fee70dd275a9.pdf
    • https://cdn-cms.f-static.net/uploads/4412767/normal_6054780d7bb1c.pdf
    • https://static.s123-cdn-static.com/uploads/4366952/normal_6000dc6fe2539.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/9c9b1732-ec4f-4c86-8745-838807ae117a/how_to_change_my_voicemail_on_my_samsung_phone.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_a7c31f7146f84ad59588db3100b770e5.pdf?index=true
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_4aede849464a4f7e92b931516cb475c8.pdf?index=true
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_34a6726d3d3140199c5259dbb5f00b0f.pdf?index=true
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_4f066ece02b04522a5ce7ed1e8c94ddd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c70d164-79c8-44de-a513-4a27174e8d08/66726695385.pdf
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_84f65c4148234ab381851877b528c29e.pdf?index=true
    • 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.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010764.bin
cf99ac0d938ada8a4cd14f05a3b8ac4b81bc3db9959dd25872392c3e01bd375f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 5744 bytes
font_01_sfnt_off00011ad0.bin
40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 3720 bytes
font_02_sfnt_off00012632.bin
99d19fea0ada8c0608c29dab4559d3d2506685495a80a0ba396b663a5fdb28cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 11748 bytes
font_03_sfnt_off00014e15.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E15 16092 bytes
font_04_sfnt_off000162dd.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162DD 4324 bytes
font_05_sfnt_off000170dd.bin
fa0e1a0b3ff7bd7890163446afbdfbe771b5640575db84e4ca514ae46ec3b699		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170DD 11180 bytes

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