Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1a444c1f05a3af…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 22:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ec78a8c8158aefc19b40ed867e1a1679 SHA-1: ad40bdd4f5af4826c64a15bdf3818e1cb3a43155 SHA-256: fe1a444c1f05a3af3cefea6bbdc302ee26b4f42365cb837bed65b770eae1599c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are likely used to host malicious payloads or redirect to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=bluetooth+turns+off+by+itself+android PDF link annotation
    • http://netmode.net/app/webroot/uploads/files/dazuzowobifowitadojik.pdfIn PDF document text
    • http://www.perlodrink.com/documents/moveruzawetu.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/23028798164.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/43803294611.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/zebozulademeke.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/laxub.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/ronaf.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/43417230461.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/97784535909.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109130254548258.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/64621386727.pdfIn PDF document text
    • https://ka-base.no/images_students/files/gunujaxefugoziremajos.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/38381498863.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/78111538438.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/29804401719.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nbri0h84f61shecmrfojgq74q5/12602820615.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/80779094304.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/48932121274.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1632203336.pdfIn PDF document text
    • http://fgosvo.ru/files/files/47108618105.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/xiwolaxuda.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/66111042368.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/22563262681.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/gusidigifuniwonadoruk.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/lonamip.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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 16312 bytes
SHA-256: 6664c167a1295fb249651eaa2b9e23c5cf8150a70067d16ec5809edab6597f83
font_01_sfnt_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 10860 bytes
SHA-256: f609ac3b482aa07c4f2a18ddcf9a1e7f11744d53042dfa764372f9ae63ca5280
font_02_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1