Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa39882bcc728cfd…

MALICIOUS

PDF

67.9 KB Created: 2021-09-14 00:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c69045b0606a775a967f20e539d869be SHA-1: c12c90472657351255d4a676529e21537f4ca104 SHA-256: fa39882bcc728cfdbea953061485f484463b52ee447a53dd3a21922b53ce8a4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://mgtuae.com/uploads/file/60347796792.pdf In PDF document text
    • http://consulcongress.it/uploads/assets/file/tiwadufanilapusogatep.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135cae83340d---38082116089.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/57554968328.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/diximisesupagosujakimese.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/dolomeloretefaminaf.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b709996cab19ba8ebb4db7a44ba1701c/5700474378.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/sopewajaxasomowafovopopa.pdfIn PDF document text
    • http://anm-av.de/uploads/files/joxeziwe.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/gefidakugapubenunavomar.pdfIn PDF document text
    • https://nevisnews.com/userfiles/51117939554.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/semidajuguxu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/kepowadilejenupituve.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/xevukexarumumuxasosi.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/66954665905.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-2/20210902065452271518.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xezopuvafadexazadasidef.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/70641169285.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/miramamazariwatamutetume.pdfIn PDF document text
    • https://mytopics.it/uploads/file/9616652672.pdfIn PDF document text
    • https://alohasafaris.com/files/83407121851.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/32334979432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+alexa+app+on+firestickPDF link annotation
    • 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_off0000acbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D2 10892 bytes
SHA-256: 2fee1509a5f552c9fd7adde9551bef1aab1018abd8872701f5374d55f1303706
font_02_sfnt_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 14464 bytes
SHA-256: 31706f1ac8b9120771a9b4f64c6f67f04306a984585a666d13243b1a47d7b815

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