Malicious PDF — malware analysis report

Static analysis result for SHA-256 7812b3c54fb6855d…

MALICIOUS

PDF

64.0 KB Created: 2021-09-15 00:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d98b3f88be8b7051480e160f0592e15 SHA-1: 2b30ac1334dd2e5b3aafeca8ad370645e76798da SHA-256: 7812b3c54fb6855de3681f6bf4c99c4508f29677fa51641587e3784eaa18ec8a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs and the structure of the PDF, as indicated by the heuristics, point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6848

Heuristics 4

  • 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.
  • 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://infrive.ru/uplcv?utm_term=undead+slayer+apk+download PDF link annotation
    • https://mysmartedu.com/uploadimages/files/30957564991.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/51202031399.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/zaloga.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/23929156722.pdfIn PDF document text
    • http://merwepizza.com/upload/file/juberolefavumas.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/92187622014.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b6b2b713bd7d1e63c70438a5c53e82c1/58901825433.pdfIn PDF document text
    • https://samowar.me/upload/file/77797142548.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/bodevojaxoruwusurovoj.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/45813795479.pdfIn PDF document text
    • https://eguiders.com/uploads/8649057802.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/76350800351.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/52769297259.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/2814182732.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161410d95392b6---71089743508.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/07/68076323302.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kituwuvotufusem.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/5220111351.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/73793550516.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090815193073499.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/solulirivanamisipirixowe.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/46083485727.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/5690024177.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/sumutevugek.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 17648 bytes
SHA-256: ade0c720c7b250bfb03e7c11901543df1407d4ea03d51a49932a022545def016