Malicious PDF — malware analysis report

Static analysis result for SHA-256 96da4ee07cf9f31d…

MALICIOUS

PDF

88.6 KB Created: 2021-05-27 22:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 48a19a0433b15c1444588678df8e6e3f SHA-1: e550b9f49ea69ed5fc08e6a84629cfbe8c494bdd SHA-256: 96da4ee07cf9f31d5031e93048d4dec1d930ecafe1eed63d2956664c60f3b093
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body is heavily obfuscated but the presence of external URIs and the link farm heuristics indicate an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=wonderlic+contemporary+cognitive+ability+test+pdf PDF link annotation
    • https://kumazazunanij.weebly.com/uploads/1/3/4/6/134622964/rufarokenuwotoxiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460677/normal_5fe2bdb29ecad.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/7671571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_5fe66be5ed50a.pdfIn PDF document text
    • https://wigojakumadofef.weebly.com/uploads/1/3/1/6/131606024/becf7473294.pdfIn PDF document text
    • https://jurutidi.weebly.com/uploads/1/3/5/3/135397820/fonejevubagor.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/3096434.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/lizupanij_gibafavunele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_606cc00244002.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/1057049.pdfIn PDF document text
    • https://degulula.weebly.com/uploads/1/3/1/0/131070998/2670593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448328/normal_6059b0fd71548.pdfIn PDF document text
    • https://devejibotabakap.weebly.com/uploads/1/3/4/7/134702496/4896854.pdfIn PDF document text
    • https://musokolej.weebly.com/uploads/1/3/1/3/131383826/444538e487.pdfIn PDF document text
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/9064198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3193b35-54b5-4e23-adcb-c06e2a9939c9/48592618568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d251a69-ddc1-4c4a-9860-3b0b29aa37eb/ikea_catalogue_2019_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd51e266-4990-483e-aad7-44d521f944b5/memawexalunemetedaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28635398-377a-408f-9aed-3934199c6f98/22396887480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1f711e-cd64-40f1-a30b-d50cc1c808e9/84197461644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa826c7-2084-484e-a161-d0d393312401/how_to_find_password_for_hp_8600_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8f3d5e-2806-4fda-9eb9-a6a72b0d1842/sakhi_movie_telugu_video_songs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d17fed3-18ba-4e42-8357-827d2da427bd/rakimeguwo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 5788 bytes
SHA-256: 56e83ced6eb42cccfc54f762f95474485550720a9774d881360fa747f76ab526
font_01_sfnt_off00012df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 11260 bytes
SHA-256: ee2ac6e6daaa1ab778332be3d6266110f3e8a04b78c27e8dac180c9d7ca7f132