Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e70800cdcc981d8…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 16:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d51fb16d296245a40e1882b2f4554395 SHA-1: 1a47f67d7181dbc1c3958c3841e102d5b4bf8838 SHA-256: 9e70800cdcc981d883693e405cf2ac6abdcf7a2b3cf42ae11e354c06bd1bc792
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. Although no scripts were explicitly extracted, the nature of the embedded URLs and the detection signatures suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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
  • 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 https://huntic.ru/uplcv?utm_term=words+that+start+with+a+and+end+with+s PDF link annotation
    • https://maggies-handmade.com/UserFiles/files/25900862241.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/92581848286.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/tudobozun.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/nedefed.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b23cf80dc9---puzovezixofiwu.pdfIn PDF document text
    • http://ladna.pl/user_images/file/2660221543.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/pikasiporakok.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/50018317765.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_081004.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/51298122577.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210904204706.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/vokakalete.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/lakevemafukipididukozega.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/80122642262.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/86507297624.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/30660849232.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/88724604366.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/tizadonugaboreva.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/92746703629.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137af7dbfb70---48232138757.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/wemizesafozelu.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/giniwojipiriremaj.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/romevifudakubipe.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/48987859986.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/5322234116.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/xepuw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F7 16340 bytes
SHA-256: 02d1c66c86db31a2e5c89bf74b2360780110069a81fa494e101105da357c32f3
font_01_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 10380 bytes
SHA-256: 10bb2469aea51c99353ef6929721343332d0c5cabde55d5ea93de8ad858516e1
font_02_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1