Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee831ca4622c72b…

MALICIOUS

PDF

87.6 KB Created: 2021-09-22 12:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13dec921c4aa27d8cdc7c6a20caf799a SHA-1: 65e3fa4618fcf66a8b490b4bd884ee69f1fa1d77 SHA-256: fee831ca4622c72b85b16e3f3160b1082d028a8ad3ee83f845777d0ccce4904e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted from this sample, but the overall structure and heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fixafilm.se/userfiles/file/23266455110.pdf In PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/76784301502.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/26416008240.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f49b534f1---39879654039.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/90771523406.pdfIn PDF document text
    • http://snsi.jp/image/news_file/biruvipigisederegug.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/mewafineja.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/zoxodisosupevixukener.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/67599310926.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/20690578340.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/muratabenijaxulo.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/48373168655.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/3786781161.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/zaxagotakijuzixifafizorus.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5aeacacd7---67559997584.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210902154418.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fakimavofo.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/gekobijugamazozomowa.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/10183556238.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/figefulukonemiwifilabaw.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/73339683300.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/12321723551.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/29244215617.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/kafafujegarutebi.pdfIn PDF document text
    • http://oris-am.com/editor_up/wufoboxupitaxik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=online+rank+tracking+toolPDF 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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 10356 bytes
SHA-256: b0d609228548bad9fd290af59ebcaec01be18c6a9ef334bd77d79aeb771ce1b6
font_01_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 18020 bytes
SHA-256: b1a1bc3e0b63ed31775176482a284350492b4a71dad3833d04195d3ab565d967