Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf1d4f20cea56b1…

MALICIOUS

PDF

67.3 KB Created: 2021-09-20 06:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25b609628dac4946764c498d16bfffb2 SHA-1: 5c0a8f66718fb9e2055caf2b168ba1005a970ffb SHA-256: fdf1d4f20cea56b1b510501ee3ab86a2c73b4c95c3428016b1b74b4ba9dcab9f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the document's purpose is to redirect users to potentially malicious websites. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4905

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.
  • 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
  • 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://gbp.dropship-online.com/userfiles/files/vuxonetasoluwajenu.pdf
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/rebavexawimuzonawutos.pdf
    • https://ever-progress.com/upload/files/92058923815.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137778625d25---mozonifejabuxaxozov.pdf
    • http://gandolfiarchitetti.com/userfiles/files/4866733072.pdf
    • https://cncunse.com/d/files/fawewelagosa.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/37565367856.pdf
    • http://themetamorphoseprogram.com/userfiles/file/ladolupi.pdf
    • http://15881588.com/ckupload/files/78035377954.pdf
    • https://airxps.com/userfiles/files/roxonininumevowutuxukoka.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/14547526849.pdf
    • http://asr-net.ru/uploads/files/zagidolumovadefenuwuw.pdf
    • http://unityproductions.com/upload/files/17670566494.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/97071987863.pdf
    • http://gmkms.net/upfile_editor/2021/files/zofojosazevabexum.pdf
    • https://atputasbazes.lv/images/userfiles/files/76357936895.pdf
    • http://copy-office.it/userfiles/file/86985635742.pdf
    • https://flyags.com/editorResources/file///kuwok.pdf
    • http://serting.eu/userfiles/files/vetifevexagitapu.pdf
    • http://pn-tech.net/userData/board/file/67920169687.pdf
    • http://nguyenxuanhuong.com/upload/files/38789673739.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210907023158.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161355dac54c77---xutekokusotavevejuzovetur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ninja+vpn+mod+apk
    • 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_off0000b497.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 16792 bytes
font_01_sfnt_off0000ccae.bin
4a8a138d415b7e852fd2bd8a5633462f8338da3421332590e251b70e07e60293
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAE 10272 bytes
font_02_sfnt_off0000e3a3.bin
cbfa398cd162496d0ef58cc5600091605b10a073a6d5ddbc7eaa9edba71046e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 17192 bytes