Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1567bfc0d7853f7…

MALICIOUS

PDF

97.0 KB Created: 2021-09-08 14:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e261e8ebcdc6d4d7336256b2b4127894 SHA-1: ef51ac4d521a145ea938ace9fc98214f6f6a566a SHA-256: c1567bfc0d7853f708fc2dbdd17724089ab01a5b5fbb551d076e26d9f5ee610b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded content indicate it's likely used as a lure, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=escala+de+barthel+modificada+portugal+pdf PDF link annotation
    • http://nato-denkmal.de/uploads/file/75536438015.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/66885434147.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/netelapebogugaw.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/12815524945.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/zipenusefexape.pdfIn PDF document text
    • https://highrise.pl/file/51012737830.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/mixajekafojunez.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/jozip.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/2351915468.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/lanosabuxexisesolufezupu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mulofive.pdfIn PDF document text
    • http://teknis.it/userfiles/files/gipiluxurenev.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/goxirofezugivebitekomanu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1fd4aaac---buvut.pdfIn PDF document text
    • https://mfdesign.hu/files/file/25339119978.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea632d4a5---dufilu.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/87422502041.pdfIn PDF document text
    • https://maymac.info/userfiles/file/vadovuxukegodume.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/poxaga.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/xinilopigot.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/nojuzolo.pdfIn PDF document text
    • http://sswjeans.com/files/18932238121.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/xozekanibutoxep.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_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 11188 bytes
SHA-256: 1dff204c705e26c8b6cc160254e39e4bafd87e597c97d69c2d83e9ed8ff39397
font_01_sfnt_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A4 19940 bytes
SHA-256: 05e6e833ef1298372897d0614f4cfc9e48dc6762f4c5b52cf03abd24a7f26c8d

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