Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f42a03e5f845f8…

MALICIOUS

PDF

82.8 KB Created: 2021-03-13 13:08:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 305ce6d1c8af7198b7436d18ebf1eb40 SHA-1: b089a018ce4166c6563a9097828d6103c95a6cf0 SHA-256: 56f42a03e5f845f861ad073972124be466c4b3339288d77a2911bb90baf2fc7e
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=height+of+collimation+excel+spreadsheet PDF link annotation
    • http://xepidenad.scienceontheweb.net/sharepoint_2013_download_a_folder.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/xumapow.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/5980002.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/Uocjcji/33424645117.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/sentence_fragment_and_run_on_quiz.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/what_does_direct_materials_price_variance_mean.pdfIn PDF document text
    • https://vurabagugodemox.weebly.com/uploads/1/3/1/1/131164039/8288640.pdfIn PDF document text
    • https://cdn.sqhk.co/vikojovowoso/ijfSifc/lumberjack_simulator_truck_driving_3d_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/jijjjii/442202580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenulusevikofa.myartsonline.com/peterbilt_579_service_manual.pdfIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_97e3cac90cc84fdcb9058bb2bd4bb845.pdf?index=trueIn PDF document text
    • http://vujapoguxesak.myartsonline.com/xiwek.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/pogasuzoguvegivozajomuvu.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/ralojawesowu.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_bf7f9c062f2d437babc1bc2a75d2572e.pdf?index=trueIn PDF document text
    • http://tizexazebubo.atwebpages.com/80311697743.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_d9a588ae686746819ba4d7f9adaec25d.pdf?index=trueIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/61029694447.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 5600 bytes
SHA-256: c28f9e867996717f4523d37646642b35be83ff6b8de29320c5bbb883aaf7b7c7
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_02_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10700 bytes
SHA-256: b9bae415ccd6fe700b5a2d64cfa5cb6e5e9cbee5533fd61c1c1a8e8691216d2f
font_03_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f