Malicious PDF — malware analysis report

Static analysis result for SHA-256 e117a776f28613fb…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 04:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbc659af6cf892449c79420bb55d8443 SHA-1: 271f085eb86e843c2f64e68bdee3a526350a93aa SHA-256: e117a776f28613fb1c40a15997573131ee9c6991dc2afeb005c8cd6061287c69
166 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one heuristic specifically flagging a link to an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the PDF's primary function is to redirect users to potentially harmful external sites, likely as part of a phishing campaign or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zdrowejaja.com/Upload/file/wafuxofoneganot.pdf In PDF document text
    • http://reckdance.pl/userfiles/file/tudowasakolereku.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/sudin.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/nawonesekokijuf.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/15123151939.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/66773875302.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/10060170628.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415bf3cad59---kenizurotorepase.pdfIn PDF document text
    • http://glassick.com/userfiles/file/65365663015.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/32852615302.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/95484780487.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/69755491939.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/ronideligefil.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/23031819863.pdfIn PDF document text
    • http://ippon.lv/uploads/File/sopokuben.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/varekaviruriwixufek.pdfIn PDF document text
    • http://smirna.pl/files/file/49611738041.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/95682344043.pdfIn PDF document text
    • https://activepymes.com/pub/file/23848571149.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/93162415354.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/dipibelaboni.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/vivokelufax.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/10560561461395f264c6a5.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/54414667266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dr+seuss+free+pdfPDF 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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 18208 bytes
SHA-256: 5d74be30f3f9280e4725ac3050d54bda6f1a2eb0716e4d49197b6cf5c7e12ddd
font_01_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 9972 bytes
SHA-256: 06fda47de1cab61cabecb37cb84d79ffd8cb8c2d922e4c604fdbc70b562edd96