Malicious PDF — malware analysis report

Static analysis result for SHA-256 4560e9a1a829fff3…

MALICIOUS

PDF

125.3 KB Created: 2021-03-16 18:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eb08dd9fbb7417b17ca322c7ade754a0 SHA-1: 4e4c5d0be0dd71ce01add699dfc739e19c678d90 SHA-256: 4560e9a1a829fff333deea3308da597679269353efb4ae5411682771579ff554
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into visiting malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=taking+over+car+payments+contract+pdf PDF link annotation
    • http://vizexibidoxi.getenjoyment.net/pugaboguvodevafewukiz.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/12050710469.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/triangles_3_exterior_angles_worksheet_answer_key.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/51860883326.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/chronicles_of_narnia_prince_caspian_full_movie_in_hindi_download.pdfIn PDF document text
    • http://bexowobiminefi.mywebcommunity.org/hermann_hesse_der_steppenwolf_zitate.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/39507999577.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/norton_anthology_of_english_literature_9th_edition_volume_a.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/zasurogediwaxipedapu.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/79732132408.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/advanced_concrete_materials.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/zulezov/bumedifigadatifum.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_6f584762e3524711993064924a565d73.pdf?index=trueIn PDF document text
    • http://xiwozoget.atwebpages.com/50917615341.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_c167d01a79a544f99b9de3a0a9b39242.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/wivobedeganazekitojoxi.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_6c737872f4cb4e40b1512bf1c5a53945.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 59640 bytes
SHA-256: e5cdbcc8ce470bbf9e24329d2d5f5f9fe3bf184542a1d2192275f53641d46374
font_01_sfnt_off00019845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19845 5620 bytes
SHA-256: a31955b43064b44bb551a3d85f15bfccb5285c6fe8edf61ea4fe0411c4c2de0a
font_02_sfnt_off0001ab60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB60 11112 bytes
SHA-256: fadaf8f50ace62748f19de923f64b6ade14e8184aca083a6a8af16000f94dfc0
font_03_sfnt_off0001d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D149 16432 bytes
SHA-256: 19207ad9ac8863b007ea8e8b30fedbb3ebbc11207020f331024e9be1dcf178a2

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