Malicious PDF — malware analysis report

Static analysis result for SHA-256 542323d340782762…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 23:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eeffba142f2c1ee7064d78685b548675 SHA-1: 9143f57ce18ba5a80466c15d8b94c0970992f1a5 SHA-256: 542323d340782762d45d8304b4845529dc0510f475544ad72d556628b127c47b
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high-confidence heuristic identifying a link to an algorithmically-generated URL on potentially disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of embedded URLs and the overall structure suggest this PDF acts as a lure to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=pdf+to+excel+converter+free+download+for+windows+7 PDF link annotation
    • http://mixline.ru/img/lib/file/59883098714.pdfIn PDF document text
    • https://festacontinua.it/public/file/57524210656.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/wiretagojixuwusatunaguruj.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/jizutevizejizixopogati.pdfIn PDF document text
    • http://tano-cable.com/d/files/teladus.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/64101984557.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/9063618237.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/momodiwevitilipim.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/ripokakizafuvezafanefubix.pdfIn PDF document text
    • http://markone-tools.com/upload/files/futekivomewulameb.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/43511208199.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/rujotepazolopebijufuluxoj.pdfIn PDF document text
    • https://aayams.com/userfiles/file/68859269146.pdfIn PDF document text
    • http://yongqingtech.com/d/files/lakixopepidutiputixawijon.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911192901.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/73036808271.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/49650913536.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/lapulemoperinew.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/89sqh80uufvf3u8t935pnjghri/75547088821.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d720be87---bexudelajavibarobolitefi.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/tubikatemasozexejemejob.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/xanut.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/56377687723.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_off0000b7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 15992 bytes
SHA-256: c9d78e23701def46a5dee0280323525a11de9b831c2cf3dc695ab2f5af45d6eb
font_02_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10772 bytes
SHA-256: 4b2ca751f6038b46e52ae95619f570654d01a746738d399be5258963bf497833