Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6a6e0190f2b2fb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 07:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08d86470e5965e52c2d4780a3bca826e SHA-1: 2e4f7611c91cf3d3826ad43a3ecc66180e41952c SHA-256: 5f6a6e0190f2b2fb1365304f7750c32bc707f1e771a604f4d5699289e6e5b0c9
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF's structure and the presence of multiple unknown reputation URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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 http://pantryscan.com/123cars/imagefck/file/niwufinirekeb.pdf In PDF document text
    • https://afayl.com/userfiles/file/zevigupifosef.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/pagafitopixog.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/97114877667.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/vexidinopavarejoni.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/87722430754.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/94692612852.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/boxilinofexux.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/piborumoxasulufazakuxuru.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/nofiwubabamizulezebog.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/jezajisetuzorepevef.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/36390141053.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137761f50ef9---15645074786.pdfIn PDF document text
    • http://446888.top/userfiles/file/98753119025.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed31659cde5861133c482b3d8a114dd3/58084871920.pdfIn PDF document text
    • http://gnox.vn/upload/files/tuwuwarorepagutunusavulo.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/56940606345.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/nanasuzobowogeporivip.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/loxetokunamemotixas.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/82318067876.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/71278676661.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/57764159660.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/vulenumotewizegelezikufag.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rowomutakuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+5+online+android+apkPDF 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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 10480 bytes
SHA-256: 715ef86acdfc01777c0a70d345ffa7b17029a4b2f60f65c4c244f9a852cab0be
font_02_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 17232 bytes
SHA-256: a3fdb08a908cd57ae77517103b19bbc0b6df9e12000187d4e244a386790a3e6d

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