Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b18ccf1217ea86…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 11:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea2081bc4c83bde3ee4871a7ac3aa02b SHA-1: e949600fa62280aff6e913bae075e54d32316cae SHA-256: 93b18ccf1217ea867193b82d6cbc28429ccfdbc36255a04692000920a87e69d3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high-severity heuristic indicating it's a link farm on disposable hosting. One link points to a suspicious domain, and ClamAV detected it as a phishing trojan. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://krisoc.ru/uplcv?utm_term=the+invisible+man+2020+yify PDF link annotation
    • http://hongdacable.com/d/files/16477696072.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210905185556.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/57938797252.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/kopovofifujagivutip.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/88148656212.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/gurijurejajo.pdfIn PDF document text
    • http://afro-safari.com/upload/files/narowenatemafi.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/31660275369.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/1617874414.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/nuduvivanizadozixade.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/medagevediwuzo.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/xikigenuxemurupodazama.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/251402488.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/98522295308.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/bonekadolimevaganiw.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/33323814323.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16308676961372905890.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///53956104913.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6bc6349f4---76783992579.pdfIn PDF document text
    • http://ibb-online.ru/f/file/neravuneresuzujujunas.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/73011abbba663b70df5ecc51a370829f/torolegepuripi.pdfIn PDF document text
    • http://synphabase.ch/upload/file/74672358984.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/mezatetu.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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 19516 bytes
SHA-256: 9d3d8f5afbabb9f2745eef4b0554d576b67a2c9e6937e7967fb7b7feda4c5fcc
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 10684 bytes
SHA-256: 51f41a9d108b4b6980c4b7a67a1e6661005eea4a7f7c2dca80d28662d284785c