Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58c20009ec3d385…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 12:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62b81720206baf2bfca6f9c4e6088d15 SHA-1: 07856c3ce1b6161079fd712cc7f3e633d50fca91 SHA-256: e58c20009ec3d38570eddadd480b01b20f538b2c93d5f9f0ab2e46c22471c404
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a redirector with UTM parameters, suggesting a phishing or malware distribution campaign. The PDF structure and the presence of embedded links point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://smidgel.ru/uplcv?utm_term=which+is+more+secure+android+or+ios PDF link annotation
    • http://www.cemeba.com/uploads/ckfinder/files/22738276697.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a83d1a1f0a---xudopisosilozedefavexaw.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/sagasiwugofonojeleliliwun.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/91388728321.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/88340447420.pdfIn PDF document text
    • http://annabarons.lv/files/files/vimozape.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/nisavemefameme.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210911231658_j9996i.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/pufigut.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/96844362012.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/69132718264.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210904235908129.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/ramolezesuluvozipanupodet.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/12025242011.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/43258630080.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/79749144720.pdfIn PDF document text
    • https://domilot.com/uploader/files/puzanone.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/10410944934.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/nomifuzem.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/34378687016.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614664dddb19a---99730345809.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/wirezid.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/65804866288.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/9750047372.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/balobalezume.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/996102927.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/90349164731.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_off0000bdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 16392 bytes
SHA-256: 11f09adc3a3feba39e5d0d895aa0dce64930a3e0e52b96ce80459662496dafb2
font_02_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 10584 bytes
SHA-256: 36e3a65908f3b3dedfbbae05ec2eb1e44bb44d4a262bee4fa831294fdf08d726