Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7953710ccd65460…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 18:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b2cd8b6ae82d9b077ae63dc25eb94c0 SHA-1: eec19db704446ec1d12ed423d6690bcacd1afc07 SHA-256: d7953710ccd65460801e450846ac501bd405478425280d43c6036be450e1fefa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including one that appears to be a redirector for a free download lure. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious content, likely through a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=emotional+intelligence+pdf+free+download PDF link annotation
    • http://jhdljz.com/userfiles/file/1632351124.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jevap.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133963fb2736---mopililojutebimijojas.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/migub.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/zumemogivixutijamu.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/47714142740.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/6267167386.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/77720486550.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/nimukitodutuvum.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/siberexepapewevawalum.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-4/20210904045332845975.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/89443291261.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/12384687615.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/49329477443.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/34630722356.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/wasugafomebesovud.pdfIn PDF document text
    • https://people11people.com/uploads/File/93890185667.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/gutoge.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/movadifevakodupezemefolo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4874630c4---fenikefojosovetav.pdfIn PDF document text
    • http://aminotp.com/upload/files/xijabozuris.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///23433463911.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_off0000ad2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2A 10864 bytes
SHA-256: 47b9bf18bd224251907ae99703576060ddb41abfbd5b2c8fa043a14afc486aed
font_01_sfnt_off0000c607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC607 15496 bytes
SHA-256: a0738171721066dbf8e3c3f4abeb2749011b2d25c5b72ce28455826a54d5e702
font_02_sfnt_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1