Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb756a6938625b0…

MALICIOUS

PDF

67.3 KB Created: 2021-09-25 12:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c5b0416b6ca46e61ba6c463cffc808f SHA-1: 7b304038090f06f2686beb1d2e9e43cb569f90d6 SHA-256: 0fb756a6938625b00ec5c7e4d85e74975dd9bd55af04ead61ea121cbc93a45be
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates it attempts social engineering by prompting the user to install a browser extension or update to view content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely to download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7771

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://suvagcentr.ru/userfiles/files/gidoxufuluparajosekupum.pdf
    • https://tenekedjieva.com/uploads/file/dejuvuf.pdf
    • http://thietbiotovn.com/Images_upload/files/23614064928.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7355f78619bafe4e133adc9f919bebbf/lutajujuligofug.pdf
    • https://inverpalmas.com/aym_image/files/fudapovupumegalapu.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/27797450268.pdf
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pusogeduni.pdf
    • http://lucca.jpsoftware.sk/upload/files/negaferifufijewuzo.pdf
    • https://monyetjoget.com/contents/files/33519460522.pdf
    • https://hyundainhapkhau.vn/upload/files/6935948158.pdf
    • http://chinawin-consult.com/userfiles/65798986071.pdf
    • http://lemma-studio.pl/userfiles/file/jezajipaxidudom.pdf
    • https://norservis.cz/files/files/volufozaxufudulota.pdf
    • http://www.urbanwaterways.info/files/32852300140.pdf
    • http://www.yoko-ono.be/images/userfiles/file/61295033870.pdf
    • https://majubesar.org/contents/files/tedozozekeratibubipatak.pdf
    • http://beauty214.com/uploads/files/202109031604467373.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/tapozujedusidumorumuxex.pdf
    • http://krasneclanky.cz/uploads/visakenidudimiw.pdf
    • https://vinatech.com/userfiles/file/tejujinemuxavevudop.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jokud.pdf
    • http://thecountryclub32055.com/userimages/kelubusofuju.pdf
    • http://kingtonkatsu.com/uploads/files/41731087729.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8d8a8d4d---gebitutipag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jocuri+cu+mine+blocks
    • 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_off0000b194.bin
97f5025e71532123e6778a7169b62418523072a6d2f8715b7eb9911b8ebf93b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 14636 bytes
font_01_sfnt_off0000d636.bin
97ab6f2f58c33340706552a612fc8fb9dd57b7050b0db8c9366f1aa8e84bf531		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 10452 bytes
font_02_sfnt_off0000ede7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16792 bytes

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