Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a127035d75e1023…

MALICIOUS

PDF

84.9 KB Created: 2021-09-22 09:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d48672478030241e4d8659dfa7434e34 SHA-1: 75bfc0a74e5298d06ae178390638d086527b20a6 SHA-256: 0a127035d75e1023c9be6564914b19e71c41da47bc4a44298f1ccd58d6600c31
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with one URL specifically mentioning 'free elixir in clash of clans', indicating a lure for in-game currency. The presence of multiple disposable hosting domains and link farm characteristics suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=how+to+get+free+elixir+in+clash+of+clans PDF link annotation
    • http://umffz21.ru/admin/ckfinder/userfiles/files/ribaratenot.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/42167500901.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/wipukegonikiwusaroboxakiw.pdfIn PDF document text
    • http://markone-tools.com/upload/files/72780575019.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/96541993779.pdfIn PDF document text
    • https://anup.bo/images/files/fiwumu.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/sedawamewupovuze.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/23732762572.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/wivebokuresofawalewuked.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210915220005389.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/wozoda.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/9269851627.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/xiwaz.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/vafatusizevewumazesoz.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/ribexomafave.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/79088301889.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/46477250458.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/15543291593.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614acdf511460---berizumexobumubaragiwu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/90885642194.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/3797205069.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210912005416_1642758406.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dajojanu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/79648727993.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/molono.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_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 18604 bytes
SHA-256: 2268a0d94ba41849db44c564b98048645d0e44364ac360c2b61f95c712c93938
font_01_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 10796 bytes
SHA-256: 7ba1fb05179d1575abb04b2f9ca2d2d79ce1dd9c1b481ab6e4c6691dc92a16ac
font_02_sfnt_off00012dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1