Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc89fde08c9da36…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 16:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6e07a19e06753f5939657c104db2fe8 SHA-1: 5c35dd0d7f9bcc2ed26811f08767823f590ba933 SHA-256: 6cc89fde08c9da36da0156b3f26f161d4b9bd73559c3f4016af5e975468b4f07
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and a large number of external links, many pointing to PDF files on potentially disposable domains. This indicates a likely phishing or malware distribution attempt, where the PDF serves as a lure or initial stage for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cn-junsheng.com/upload/file///20219215589527.pdf
    • http://toyotaquangninh.org/data/dulieu/files/losuvexajivazivazekugobiw.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-01-20-36-19-81.pdf
    • http://altronic.pl/!mag2011/userfiles/file/16634823456.pdf
    • http://villahetzwartepaard.nl/survey/userfiles/files/41504143567.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/74896562077.pdf
    • http://vncdata.net/app/webroot/uploads/files/xemitavudevoxitisimedade.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/acadeceb249e3334fb92ee153a5dfdca/devusulofalimiwavimuv.pdf
    • https://needletherapy.eu/upload/file/31644071842.pdf
    • http://khmim.com/ckfinder/userfiles/files/5822229227.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/wikanunad.pdf
    • http://yasairamenbar.com/uploads/files/kosof.pdf
    • https://stockbauer.hu/uploads/file/92769856488.pdf
    • https://affordans.com/ckfinder/userfiles/files/dusejozorenus.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/84029731921.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/72095384461.pdf
    • https://halkapsikoloji.net/userfiles/file/zazobujago.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/gegafijir.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ef93n45o8hf2i58rotdtkg8hn2/32633755494.pdf
    • http://www.zywawiara.pl/pliki/zuvodivagafas.pdf
    • http://regalmotors-jp.com/js/upload/files/ranalox.pdf
    • http://purel-biopharm.com/upload/files/nelaxibojamigobunekar.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nutricion+en+animales+vertebrados+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_off0000b32c.bin
9d1f0da4c8e246e423c7c019206e8a5d423f31f762871ca26bffefef17a055b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32C 11064 bytes
font_01_sfnt_off0000ccbd.bin
f8317a4b5af2634f188594e055c6091df41f6a4240bc98d43ca8e6da8ec3efde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 15420 bytes
font_02_sfnt_off0000f243.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 16792 bytes

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