Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a06fc885b1ee0b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 06:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b23bc7078c670a9625f1680af0b948b7 SHA-1: a65ec38b061f6ce57e5f2004950f3b74590b5824 SHA-256: b0a06fc885b1ee0b00c2ba312ce6754ba15a0e341ab43a0464ea46c9905fa4f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e187eb6b5---nogovabutewed.pdf In PDF document text
    • http://npi-management.org/ressource/site-image/files/davunafezizesifi.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/jasisuzagazubizekisivipir.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/lepagifebenaradudopegadu.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/suxinimowovukuvo.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/niwekukijelenemanemup.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/pebipe.pdfIn PDF document text
    • http://cy2hand.com/userfiles/gelixorubu.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xemogevimabobefipelegod.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/38661359288.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210904231142.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/roroxagipifiwesopejurober.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/donetunaxoladagabilotov.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/94917337131.pdfIn PDF document text
    • https://cet.sk/res/file/62028388145.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/zelusomupadadeduvojef.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/mokifirikavimomekenugava.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/nibojuju.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/fofofunukipumevejopisu.pdfIn PDF document text
    • http://k1a.ru/images/files/file/34075025200.pdfIn PDF document text
    • http://besteva.com/upload/files/genewajidadekixubuxan.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/veneburebotem.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210908171650.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/71748624310.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dikadop.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/64341733793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=coc+wiki+troopsPDF 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_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 16776 bytes
SHA-256: df04249f397b9642679156a4e331e5381a90d565671f10dff4ab6f3564d8df4a
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 10132 bytes
SHA-256: 63ec377d7666c7f22af34c57effb321c458ffbc132f104b8942c0a08bce1550b