Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c981d0752dd8a4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 03:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a85bf1d9372e7a71cdf893b80148984a SHA-1: ba4a0c9b79732abbfeb76c4d9f714c91780c4fd5 SHA-256: 78c981d0752dd8a4a8c6431e55db4a7bc28f609ef1ae1374922ed8c0a6eb3fd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allcreaturesinc.com/files/files/87770743176.pdf
    • http://jfe.hk/userfiles/bumeresamulewu.pdf
    • http://tiendanatacion.com/noticias/files/25603580990.pdf
    • http://pkynfe.net/userfiles/file/88641431015.pdf
    • http://hunicorn.hu/userfiles/file/41065260226.pdf
    • http://goldendazzle.com/upload/quangtri/files/90808469591.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/kixowitumem.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea975f3c01---25013834179.pdf
    • http://szwygs.com/upload/nekemudolupuvawixefogavi.pdf
    • https://millersexpress.com/userfiles/file/53496682601.pdf
    • https://skinrepublic.vn/webroot/img/files/sibajix.pdf
    • https://nangluongvada.com/uploads/files/34421079586.pdf
    • https://stillwaiting.org/userfiles/file/gujuboruzimujija.pdf
    • https://greenboo.vn/uploads/files/vumunumoz.pdf
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/96512489573.pdf
    • http://dhf-china.com/d/files/73638988639.pdf
    • https://marwaservicecenter.com/nbloom/fckuploads/file/zizekejisodurasaxoga.pdf
    • https://learningsolution.ca/userfiles/files/josuvifanakida.pdf
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/91157561637.pdf
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/24714042774.pdf
    • http://speaklifeiamgreatness.com/files/files/vogeg.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/2704728802.pdf
    • http://ornito-silesia.eu/userfiles/file/17992294691.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=inseparable+phrasal+verbs+list+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfee.bin
423caaf8fdc59cebe02e631cad0171378e023dab3740acdced34a589a634e3a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 10632 bytes
font_01_sfnt_off0000f7ee.bin
ff4ee6b8d48a7b19275e66c4418a8ba439877f7b9d00e77d793b7a2573dc9927		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 16728 bytes
font_02_sfnt_off00012349.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12349 16792 bytes

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