Malicious PDF — malware analysis report

Static analysis result for SHA-256 66816d4624801ac5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 21:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fecd760e0ece72863a2699211569ed5 SHA-1: 8f6bdc24b3dff43cc1d9b3a6df744aa8193010df SHA-256: 66816d4624801ac589738a137eaac7f155c8edcb2d0442471d58a7c95a0576f5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of a 'link farm' heuristic suggests the document is designed to host numerous links, likely to further malicious content or phishing sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing on 'PowerShell window. Set-executionpolicy bypass -Scope process' indicates an attempt to execute commands, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gangnampools.com/contents/files/85517327409.pdf In PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109092120523718.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f6a9272c---rixamadobukalelijisije.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/701163778.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/12546207183.pdfIn PDF document text
    • https://razredna-nastava.net/files/59001120775.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/42132535573.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0ad114f6f4366fc82390caf96a1c8162/timuvuvimizagosusubati.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/19379195819.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/17364296497.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/44051400761380fce93a20.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/33787266253.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/23260338368.pdfIn PDF document text
    • http://kisito.com/userfiles/file/jabavuxanakaketoporigewi.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/diwozulojijoboja.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/ludomimopovakazokijafas.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45607868206.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/birotuditujaxadapiga.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wizomexigu.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/37442747930.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/51256515977.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/85776793074.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/20457710808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sdkmanager+install+adbPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10780 bytes
SHA-256: f9412797656dd579a1b914608d77ff9796fdafb66bee2e1b27910d3651d3d858
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 18592 bytes
SHA-256: e8740cc8c7252d38bb2d0094f8cb0a24c0aa1c7ad136f5100372bfb53aac89f5
font_02_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1