Malicious PDF — malware analysis report

Static analysis result for SHA-256 c187e42a10d13ecc…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 09:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c814c33bab60669049cca4efc7faccaf SHA-1: d2542080e1415a96b681ee611e5a7c446afff13d SHA-256: c187e42a10d13ecc7d6c971b4c88e4fefe56cf1505c46f67a42447e810c9f785
146 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URIs, many of which point to external websites or IP addresses, suggesting a phishing or redirection attempt. The presence of multiple links on disposable hosting and the use of UTM parameters further support the conclusion that this file is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=voloco+full+paid+apk PDF link annotation
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/18799717024.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/35b57d2c9867695a571010b5c1ff4cb3/31407166661.pdfIn PDF document text
    • https://plasterglasgow.com/fwd_docs/file/49282154444.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1614b63bd3c4fc---24037541123.pdfPDF link annotation
    • https://kochitaxirental.com/ckfinder/userfiles/files/sadixoxozanisak.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/24455481049.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388a79f4030---widis.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/5762440340.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210912073604287.pdfIn PDF document text
    • https://khanikango.in/file/libamavipemoliwajowodiw.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/58498948587.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/dukavoxokubo.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/79720608233.pdfIn PDF document text
    • https://bursac.net/userfiles/file/siwaposuruvojikivubaril.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/vusififemarirutubofonoxaw.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/tegekemixi.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/betomesakuwipamuwuko.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/vopim.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210921065211.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/2350869753.pdfIn PDF document text
    • http://tochalco.com/uploads/files/nozujuzijegenanikelipobik.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/jiwibob.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/27730399793.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://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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 14680 bytes
SHA-256: 1daa9d1af47fa58581deba3d1293665d04089c844fa39da7f51e4aca0ae6ebb4
font_01_sfnt_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 10172 bytes
SHA-256: d1be271365e515a5ab94300630a8a7f37a07c37fdad87c6261c48b610e07eda3
font_02_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1