Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a38ef53ae436f40…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 09:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edb059ea1e8332321ea48f6299f2f063 SHA-1: bfba7788c86e6100538a1bd02a4469e6b4a58ec2 SHA-256: 2a38ef53ae436f40cd72c0230baf38adcbfeef48ab8a180a4e19aac6ccad3fcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and the high number of external links indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=rupaul+drag+race+all+stars+2+full+episodes
    • http://bsa-billiard.by/images_from_html_editor/file/38999977173.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/43312984976.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/dumilikabiduvipumekobekoj.pdf
    • https://iuoshili.com/upload/users/files/vutijomimif.pdf
    • https://sgotomotiv.org/upload/files/85250049573.pdf
    • https://muguet.fr/sites/default/files/file/6636200187.pdf
    • https://hkparkkonutlari.com/image/files/xosudoboxepozasewukixise.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/83593932528.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c7740eac---90685187347.pdf
    • http://macautemple.com/userfiles/file/lefavakobux.pdf
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/8900809257.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/tijulajobujo.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/50163019084.pdf
    • https://farmacieitaliane.com/documenti/file/loverowadajisumo.pdf
    • http://italianopizzeria-pg.com/uploads/files/82097322629.pdf
    • http://erodiertechnik-wenzel.de/userfiles/file/lifijazetitewadoponiworo.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b08212c1---76803795104.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/69576386626.pdf
    • https://vanphongphampmc.com/upload/files/12743022567.pdf
    • http://tinhdaurosa.com/Images_upload/files/59007021903.pdf
    • http://piazzademarini3ge.com/userfiles/files/94920394613.pdf
    • http://spiregene.com/image/files/20210904_223706.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d064.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 16792 bytes
font_01_sfnt_off0000e876.bin
965e0ad89a2bc5b14e9449b8dc527b798aec4563ab125dfc939e22108d141bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 18840 bytes
font_02_sfnt_off000119bc.bin
a89f96f48b98ad4200f6cb428d5805d93f6de4131f453fe383bcff77c234b8a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10956 bytes

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