Malicious PDF — malware analysis report

Static analysis result for SHA-256 b607ef6434508003…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 03:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: d4146be578dead1cecf8b0f9981cca9e SHA-1: 905d5a24cc0012c66a41cef7bb37afb3908e7631 SHA-256: b607ef6434508003ae6e533c60b44734a70db0d3bec33d68fdaec0b4cad537dc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a malicious PDF by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious domains. The PDF's content, though heavily obfuscated, suggests a lure related to a 'calculator', and one of the embedded URLs is associated with a link farm heuristic. No scripts were extracted, but the PDF structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4864

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://chithanhplastics.com/uploads/userfiles/file/bedemagurixisam.pdf In PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/80253661603.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/4280111454.pdfIn PDF document text
    • http://foxhill101.com/userimages/83074836153.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/lukaka.pdfIn PDF document text
    • http://hidropro.hu/upload/zamasavesenafapal.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/51581837574.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/3705594099.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138400b071b3---38636441526.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/rodawupofizadugovozake.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/78064786188.pdfIn PDF document text
    • http://langmypham.com/luutru/files/kofubadituzujovip.pdfIn PDF document text
    • https://alev.az/userfiles/file/16021837831.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/zimuvizukokawosoki.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/xezovaremo.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/rokitanasuval.pdfIn PDF document text
    • http://iknow.pl/files/file/64680061415.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/31500158483.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/6100154306.pdfIn PDF document text
    • https://nexusmediation.nl/files/vagixejawefezuxuzolo.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/fevevagumasetada.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/87588814368.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/76892286668.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/02/juleguwunena.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/nikuzoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=stp+calculator+chemistryPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 18384 bytes
SHA-256: 19b9d52e25ccdcc9cca932d7f9d68bf855d77c689d6128ed07545b6c4cb619d0
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 10824 bytes
SHA-256: f7e2288f9aff40dc51ad9dea6571305964ae1b2bfc8d5132d5e3e85661708314