Malicious PDF — malware analysis report

Static analysis result for SHA-256 87001801716c71a6…

MALICIOUS

PDF

90.0 KB Created: 2021-09-12 15:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 809f8167fabb61ddc30e7a287d19c5f0 SHA-1: 60bdf6b0df53c272fe6a4d38255ad86b61f1b3b8 SHA-256: 87001801716c71a69b6f75c58470844278dd45ee68840fa47559a430f4ac9c95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, further supporting this assessment. While no scripts were directly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://eiak.org/upload/editor/files/6632021352.pdf In PDF document text
    • http://bookblog.kr/data/file/files/44354743325.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/69478617455.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/lakowopebopameledojuzag.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/fomukaruwakofaguvisoxoga.pdfIn PDF document text
    • https://birudongker.com/contents/files/kegeronotezinuketapi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4a927ad811d64d75a2fa6623f84b4301/41394167678.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3be4b0d83---madufutite.pdfIn PDF document text
    • http://alcantara.cz/data/file/zakiz.pdfIn PDF document text
    • http://honghuibio.com/d/files/zijasawisenifagenujotelat.pdfIn PDF document text
    • http://meta-min.com/files/vugaju.pdfIn PDF document text
    • http://ewtch.com/upload/files/bewamefiwulom.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/sukijupuwizawixa.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/26367254816.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/59331706939.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/37448923244.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/xedilugukemafevigi.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/mozovavobudopalobuliji.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/23050234260.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xobufabekumukoreze.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/wilutafafifodakalago.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/xotokisez.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/12136975230.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/35313115438.pdfIn PDF document text
    • https://12tiga.com/contents/files/puxetezuwafesarimibi.pdfIn PDF document text
    • http://446888.top/userfiles/file/vowuzotolavodeximol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=glim+icon+packPDF 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_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 17784 bytes
SHA-256: ba1ede41bd94c91374f0cc82a7e6bef4999ca9284457bf9722f28529b8b57415
font_02_sfnt_off000143d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D9 10168 bytes
SHA-256: 379794e0ce2205bbfb94cc5063191f9a6c5f1985ade9fb73b1f975e0efd91e5f