Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c478eaac3520c5…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 21:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1df1daff8aff72454fbe0f643f73dbd9 SHA-1: ad81ae638a508711648a1a1ba393de051bcd9031 SHA-256: 05c478eaac3520c5bd07bdb18303c759889a6fa33d3081a0f5733d0dfdeab814
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=pixel+4a+gestures PDF link annotation
    • https://luatsubienhoa.com/upload/ck/files/denaxazij.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613604c718fc1---xivugufezaku.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/vilekumigupimixora.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/24512696880.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/jolufakafosiworovup.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/xiziniwudinonoradutelebi.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/36859204741.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/69595498157.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/26701141288.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7ntqd96m3fgprm0bbpm8ihe6li/bunesugotu.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/dixibotogipi.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/35370844134.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/49843334884.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/xopesanizudefejiti.pdfIn PDF document text
    • http://onelove.cz/file/13234689279.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/mafejipe.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/47859358758.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/31832849648.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/mojiv.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/jibusiperurowu.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/samixabofetowagaro.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/31167744979.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/soxofenivifite.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/foxovixuxafa.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_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 10340 bytes
SHA-256: eb802dcaa883c7a3ca6e349bb9315617e1f5277afdb457dadc72e2c5e92cb689
font_02_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 18080 bytes
SHA-256: d99f976fab1ff84e98fb01b5bb3d3dac5cf01fcd4740563b7f6ba84712feb195