Malicious PDF — malware analysis report

Static analysis result for SHA-256 c117347b142879a0…

MALICIOUS

PDF

75.9 KB Created: 2021-09-09 16:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c79b0603c8acdb138511d4536c55bec SHA-1: f5b43b2259d20d5571f720337e730b734a1891d0 SHA-256: c117347b142879a033e5468a974a9327ac601232ff2c42de203d17f6feb759f3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests the PDF's primary purpose is to redirect users to potentially harmful websites. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://xo-sound.ru/userfiles/file/58023362429.pdf In PDF document text
    • http://guitarenko.fr/img/files/67025114537.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/novojizuzijotijubixizala.pdfIn PDF document text
    • http://alkanboya.com/files/file///vokox.pdfIn PDF document text
    • http://gazetavk.ru/img/file/gawepo.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/18151745078.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/xexakufubovikat.pdfIn PDF document text
    • http://lagrupacio.cat/file/nagulukexagaxubunukomof.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/zoxigefojezumipojib.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/81010923811.pdfIn PDF document text
    • http://cichanski.com/Upload/file/65905286982.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909182028.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/nivakefarutemisabojawixo.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/poxebifajimimevinukujagek.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/42199730206.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/pilevapirigejewiri.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/12883857943.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/dosabasapexagelimezado.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/bakamiwabozesanozuliwov.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/2782234070.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161333aec512db---mawigevawe.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/sajelatazoxilibib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bhabhi+movie+oldPDF 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_off0000c467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC467 10300 bytes
SHA-256: 92e2423a5569eaf7e0fac9b3d6ef18b2345acaa223de8b2895f0f27a0463a956
font_01_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 18056 bytes
SHA-256: 6a92781e57cf787795fcba1d9fa7f4391b4517dd1845cc12ce9847fc149f4772
font_02_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.