Malicious PDF — malware analysis report

Static analysis result for SHA-256 13117c9fb11deb8f…

MALICIOUS

PDF

85.6 KB Created: 2021-04-10 10:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ea6da6e72ff0870fa3c4142cfaecbbc6 SHA-1: df5ccb59652a3d875c523e8e4fca48a163d35524 SHA-256: 13117c9fb11deb8f184ef88cc214f18fb31c3a9689a1d1f6cb1bf9c8a9639de6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one on disposable hosting, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Barron's sat subject test chemistry pdf free download', indicating a lure to entice users to download the file. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=barron%2527s+sat+subject+test+chemistry+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fef5398d75eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_6020c3ebe9996.pdfIn PDF document text
    • http://subejewumo.scienceontheweb.net/asca_national_model_4th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fcc00f79fb75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jovurafop.epizy.com/niwufofevitorup.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/pamumexos.pdfIn PDF document text
    • http://wunozoviwo.epizy.com/pimiranadirodozenagid.pdfIn PDF document text
    • http://kanufes.rf.gd/dulovojulurejukupipepon.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/chemistry_hsc_past_papers.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/kivadof.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/how_to_find_edge_length_from_density.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c5d504-b62e-43c1-8582-f1a48900164c/dakajivonubawaragugapife.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/how_to_tell_how_old_a_coconut_tree_is.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/79021579031.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/35535474734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d79bb8-4b08-4bf5-85aa-7927d04106a6/60476561261.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
    • 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_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 5888 bytes
SHA-256: 30f66d44d0305851f2cff79c793963392b368c48de8dc2f3d1922226ed7f49fd
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 15804 bytes
SHA-256: 3d373e72dc6af0b831d025a14c86f4e5ab0f1388373acab39f46b1580225f251
font_02_sfnt_off0001334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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