Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30db6cb7b8fee80…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 17:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad8fc77468185b9967c56c7d85fb0945 SHA-1: 848394224bb4a5732fd8bab2699a5225d84ee41a SHA-256: d30db6cb7b8fee80142223a471b6f2742c04875c2723db927b8adb4add802ad7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous extracted URLs suggest the document functions as a link farm, likely directing users to phishing sites or malware downloads. No scripts were extracted, but the structure and heuristics point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://matras-devison.ru/upload/file/dubufalatokadube.pdf In PDF document text
    • http://lukasikgroup.pl/Image/files/gatopojeme.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/34335283253.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d33e30b1---netogaporawogewazufu.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/8986612934.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/65418056359.pdfIn PDF document text
    • http://husplaza.hu/editor_up/wowinipexuse.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/vurexude.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/73214373073.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/gijufu.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/69559970583.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109050856157580.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/gotakirowibowopibenonaz.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pivuvijasuf.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ff563a35---zunopavi.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/65797108002.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/pifati.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210907091249_94564800.pdfIn PDF document text
    • http://candientushinko.com/images/file/weribikukogede.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/8274841275.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/17980158269.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/13396208498.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/59151629705.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/8383542119.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/88071187551.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/17842967582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=body+systems+concept+map+worksheet+answersPDF link annotation
    • 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_off0000c685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 16388 bytes
SHA-256: 7ceeb6335f6da931a30724d5d17f935b3ea58bb5124c7bdd6d0108cffb7ff0ab
font_02_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 10988 bytes
SHA-256: 6f25c21c8079d3d422f3c0f9fde278a83a6779292183bc8a8c61d8fc3a5100b2