Malicious PDF — malware analysis report

Static analysis result for SHA-256 107c93b07f323e4e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 10:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88edb90354a8421863cdb2cbd052c6e5 SHA-1: 2ec256f5d276ad6c6cc4df7d6eb7c43058151708 SHA-256: 107c93b07f323e4ef2e7da44b3058fb46fb7c51abbf510f17c0b61e8e9ab4fb8
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 threat. It contains numerous external URIs, with one specifically identified as a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to drive traffic to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=aerofly+2020+download PDF link annotation
    • https://letstravelforacause.com/miet/assets/files/moranulemofi.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/10906737902.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/fanizoruzunivudabewikoxam.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1638797441612f3e01e040f.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/91532819865.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/88739696825.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/66434187603.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/43747610546.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed7199eff---lotexumi.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/mopogazejexujojefowaval.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/80266554600.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/surexap.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/48878980400.pdfIn PDF document text
    • http://chinalabware.ru/d/files/19309440418.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/18715044007.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/35348303537.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/910ff72d8d46d99a7ffc9f0884d839c2/4849738705.pdfIn PDF document text
    • http://precisao.org/files/files/nojesozuzikoxejapunotomu.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/36231122935.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/59810815222.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/vutilagumeruduvonapileler.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/3665446467.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/tuzogagokeperezadoj.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/gexarujavaf.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/gojirewutixomor.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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 10412 bytes
SHA-256: 0c70c39eddc28bb1c4a6dea5de5fb80bae22bb721eda5b2438efb2b0255b2e08
font_02_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 18212 bytes
SHA-256: 3783e48693e957b47c4b46716622b8fda761f38525025bb96ab3a94dd0d040a6