Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18dccd7d571e259…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 01:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f618c4aea71ee9d8070e994345f34fe SHA-1: 92b76bcd3d3e03acaf88cf06b4bcf295ea8d382d SHA-256: a18dccd7d571e25972ce696062adad6f602ea7c73172142d911faca7fa93cd49
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by an ML classifier as malicious with high confidence. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to other PDF files. This suggests a tactic to distribute malicious content or manipulate search engine results. The primary attack pattern involves directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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://hai-bi.com/uploads/files/202109030148223422.pdf In PDF document text
    • https://cplastik.com/data/cms/file/wugipobo.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/51664002864.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/78097919911.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/toxulezopekafenukokat.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/bunevomiteroze.pdfIn PDF document text
    • https://invest.pl/userfiles/file/watepemajixuzutulimowumim.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/fajolabinudut.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/98975781606.pdfIn PDF document text
    • https://gencatakan.com/upload/file/punesuwobubuwafini.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040a21ee78---kovowidob.pdfIn PDF document text
    • https://kapefashion.com/files/files/43522248693.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/ralifi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/37859222400.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/nejitinomoxezunuzupolil.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/magudokujoj.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/9635415713.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/patatawedewolofizeke.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/xabupu.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/gipogipepe.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3bd9d20c---23364025919.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/38840067688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=things+you+can+do+with+your+android+phonePDF 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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 17620 bytes
SHA-256: ed92fbd09e27a5dbabda2686babe9f856f5a49db7cfe458c87253125d5cd70f1
font_02_sfnt_off00012e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1F 11008 bytes
SHA-256: cfdb9a509b2ceee8415cfc7693555a3705b8f8fb98ab928a0d7f3d1f6941659c

Open this report in the interactive analyzer, or submit your own file for analysis.