Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e74fe3edffc8bd6…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 19:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfdb4eddcee08b1f7e3e3e2b10839ec9 SHA-1: 65da08e8801afa26ebc440ac692b63c2fdeb9a0f SHA-256: 1e74fe3edffc8bd68d27f5bd5729003c0546d78b856be6b4fcd9912d75643c24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm behavior suggests an intent to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.weldcor.ca/public/ckfinder/userfiles/files/20651410990.pdf In PDF document text
    • http://jjw-led.com/userfiles/file/95943394458.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/gepobiripumideremef.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/5b6c318k2p2a26dd45al21lsq8/43571112295.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/sevesefuxumuvatosinosa.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/binarusadazuvozuzesororov.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/lifukibigi.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/27152389192.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/nezukobubataboxekaperug.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/67740176678.pdfIn PDF document text
    • http://riviera.az/userfiles/file/58001017924.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/53807271205.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/77314901397.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/68496686426.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/lefekivududevo.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/tipitorejorelazodavawuge.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/lexirakagapapovaxus.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mekigatebelazolud.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/10802431633.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/lozikegev.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/80055220901.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/bajizozodomutozaz.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/40433665150.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/rofufuxapezewul.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/vuzunujoxeviwelagam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=harga+hp+android+cross+a66PDF 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_off0000b6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AF 10676 bytes
SHA-256: be46d518b71701e940bd46688c9e74456319f1752634a1edd99bfb98459c95dc
font_01_sfnt_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 16500 bytes
SHA-256: 01b512726a4da97c0be52864ae4dc058658f2fa2ab470619c95d2baa799656be
font_02_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1