Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabc0161668f356a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 22:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e07be35682f7ce2ae4c9e4a1222f1a4 SHA-1: 8bd23fed1c7b2339c25db0221647d604de6e09e6 SHA-256: dabc0161668f356a6fe12e0521316e8bb4a1279447fc5ec09e9cd38797f0da91
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and are flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dungculamdep.com/fckeditor_userfiles/file/82186801369.pdf
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/60175138372.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161458e088525a---61242749685.pdf
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/wokapa.pdf
    • http://farmaciafici.com/userfiles/files/56514785521.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/lakew.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/mimawugibinusugorixi.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/38096225465.pdf
    • http://fteq.ru/files/file/kutewasokuzajanowejiwore.pdf
    • http://interreg-ipa-husrb.com/downloads/36144134181.pdf
    • http://euro-ex.net/images/blog/file/9870933504.pdf
    • https://viettrungson.com/media/Files/5346026199.pdf
    • http://exmar.it/foto_fck/file/jenovamadofofesi.pdf
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/92132579415.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/64056224059.pdf
    • https://elitstroycraft.ru/source/file/wojeg.pdf
    • http://noithatmyhome.com/img/files/ribirekuxirumuvonemeribow.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/giraromotujokejagi.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/372c72d4a0f14a97d69cdc443a8855cb/92888774436.pdf
    • http://fmi.lu/userfiles/files/69613365174.pdf
    • http://vladekoservis.ru/files/padafisufana.pdf
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/80220702977.pdf
    • http://pensjonatagat.pl/userfiles/file/vogoxufufe.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210914_E27F2B196DE4FB89.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/31031279215.pdf
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/55293802802.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+hate+you+give
    • 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_off0000e6e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 16792 bytes
font_01_sfnt_off0000fef5.bin
706314499adbb7a516271bc948815d0fdd7d606abc19f4b41f32e7266a918b32
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 18052 bytes
font_02_sfnt_off00012e50.bin
a5fe0f500b8030561b8ac4f8d94659b596fc47b639791bb72c714d33e4a2339e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 10212 bytes