Malicious PDF — malware analysis report

Static analysis result for SHA-256 c917eb38264ef254…

MALICIOUS

PDF

93.4 KB Created: 2021-04-03 20:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a8c045f3aa9f1d8c6aa99bef25c15acc SHA-1: b5dd2b31b5ecd9d5fe4982e9366f38249d9c8eb7 SHA-256: c917eb38264ef2544326f8581e71f329cdb5524b982f7d2810cbed3bab9a1f7e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one identified as a link farm on disposable hosting pointing to a suspicious URL. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://lozipotod.ru/123?utm_term=adanaspor+formas%25C4%25B1+nereden+al%25C4%25B1n%25C4%25B1r PDF link annotation
    • http://tepifugamokeg.medianewsonline.com/95717696150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_603e17b316705.pdfIn PDF document text
    • http://nijewogifuzazi.mypressonline.com/nokomiwuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/bij6rgg/white_triple_bunk_bed_with_mattresses.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/hdahhlh/74697292807.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/courage_to_be_disliked.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/artocarpus_integer.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/Hjhjcnt/using_united_mileageplus_points.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/jaggohe/lebara_sim_card_activation_germany.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/yhgfijy/pagagawul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_603eefc8307c4.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/Uhfiggd/fikiwapupine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonivezada/electronic_circuit_analysis_and_design_mcgraw_hill.pdfIn PDF document text
    • http://tibutariwu.myartsonline.com/functional_groups_in_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/les_cercles_de_la_forme_diderot_avis.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/16647245939.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/bidopokojejuxumefixo.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/gufumo.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_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 5208 bytes
SHA-256: c6230a9a6e7e10102f719a8d64d8eb5458db0108ff652913e50e9fe9593f665f
font_01_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 13680 bytes
SHA-256: 82a115ac740663812de5f52db8a44ce6a9c9b56e21d99c51a97375346b5c251d
font_02_sfnt_off0001516a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1516A 16140 bytes
SHA-256: 0dd0f70575564cfea764bcc00266283b8a18401ff3d5346bafa654237f32d589

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