Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aeb5dd6ff7f5823…

MALICIOUS

PDF

74.8 KB Created: 2021-10-08 14:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3cedb8edc6efb34813d420addf80a092 SHA-1: f401447274a2f31def50c72ef29cf31573e94b0e SHA-256: 2aeb5dd6ff7f582374458f1a996982ae2ba244ed48c4b3bd68caa05583a5eee0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=lavender+cuttings+in+water PDF link annotation
    • https://paymentor.nl/uploads/file/14662552321.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/sufikur.pdfIn PDF document text
    • http://tid.vn/upload/files/41540053099.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/23036937813.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/59457443346.pdfIn PDF document text
    • http://rococosofa.com/files/files/52963743887.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/22657258533.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/duzawexanupokedabuzirum.pdfIn PDF document text
    • http://holzweiss.at/pawipipedavofekixazokono.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/riropepelelebidegupepi.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/55465626526.pdfIn PDF document text
    • http://househouse.it/userfiles/files/nufobar.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/90984928319.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/kuxanevabaje.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/jekelunarifasuxazenofam.pdfIn PDF document text
    • https://carlojans.com/cms/file/48292861789.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/63243528663.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/wibobux.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tumexogofugiloloz.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/tebinafapoz.pdfIn PDF document text
    • https://blugarden.eu/file/funosobopunafuwe.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/82439578943.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/tujet.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/mupukolimar.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/89780933513.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_off0000c208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 10588 bytes
SHA-256: 75554e2b5f2ea0f817c88048f830b85afebed29d5ef295fbde76e006004b96f6
font_01_sfnt_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 16992 bytes
SHA-256: 5c6c6d1fab7284c17ea7be99e6b9f58c9b25819773a4a26b5b383f6ddbfc92e1
font_02_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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