Malicious PDF — malware analysis report

Static analysis result for SHA-256 a030df82cd8b9eec…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 22:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b894b70ea0cf882153f36cfac31aae87 SHA-1: 5ef4315312d8c5c66377677589b205d36fca145e SHA-256: a030df82cd8b9eec63d1e89374ef44d3f92b403c2ed9efacd2e5cec1d36a5335
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the presence of numerous links pointing to disposable hosting, suggesting an attempt to distribute phishing content or redirect to malware download sites. The embedded JavaScript likely serves to initiate these redirects or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mimpiindah1.com/contents/files/89772259385.pdf In PDF document text
    • http://grupopiscis.com/upload/files/toporinurafowerikajojelux.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/49245530518.pdfIn PDF document text
    • http://cssh.es/img/file/6642904932.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a55630f02---36799089393.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vobaw.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gilupejifedozekekino.pdfIn PDF document text
    • https://grandegroup.net/files/34069524550.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/jowagudadawerax.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/1197333584.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/51607441517.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/vekagijimexafunavesi.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/pabevipavidubo.pdfIn PDF document text
    • https://ags-car.com/upload/files/sitojirawo.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/24817830140.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/10042492977.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/50018317765.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/suwuwin.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/keladumizalebu.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/moxajuwosoz.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/10444045990.pdfIn PDF document text
    • https://seerupit.dk/assens/file/73537380824.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/51320062272.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2fd1af64eb1aa7a18fe6f5f703ce9ed6/77975880358.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/zimizemopaparaxiribegob.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210908/1443266979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tamil+2021+moviesPDF 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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 10292 bytes
SHA-256: de39e113edc2d5dc18700d5da02ace68825e5a4b378c552b6596ba67a4b1cbae
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 18244 bytes
SHA-256: 6be7e24f61ab850ee8e15b590da1748c4a6470004830bf2332a3fe4944f21bf6