Malicious PDF — malware analysis report

Static analysis result for SHA-256 108c852d7aa4a429…

MALICIOUS

PDF

80.9 KB Created: 2021-10-10 14:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f5b9355ca618ebadb8434ae39021fb86 SHA-1: a6a367ebbc8ea48f88b89a2073e6c771c91c0926 SHA-256: 108c852d7aa4a429e6444fc337fad61520539d2be66d77d0a0ecafd8eeb53429
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, many of which point to domains that appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://banglenhospital.com/UserFiles/File/97647202131.pdf In PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/vodudijikejaxowugi.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/sarotivabiwur.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/82259050973.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/dusab.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/83184199123.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23710304448.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/senamalevedofugakitumapop.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/78865198516.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/vaforujexu.pdfIn PDF document text
    • https://allianztc.ro/files/file/87301067436.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/zegisetubenakujudok.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/kuloxafivofi.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/64564225276.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/38933468954.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/16685831993.pdfIn PDF document text
    • http://szhlfz.net/upload/mipunarilobeko.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/37408885379.pdfIn PDF document text
    • http://chromavials.com/d/files/zerokakixotesalakotiwi.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/63579084319.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/11987937208.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/31871715419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=5+letter+words+that+start+with+t+and+end+with+ePDF 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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 18452 bytes
SHA-256: 33c67bf4e4706c718c50fa221239e67c88e6991a75f1d092a477bf255b77ac91
font_01_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 10468 bytes
SHA-256: 9c986bf60a99bd6969364e93861ff0e9e4e52130d284b741a9ab4f37aa1a5f68

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