Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c875e4b7309248…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 05:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 030a3f65add9c50f7304d434906bb262 SHA-1: 2622bc48e58260ac0b2c66fe70438a640bc634f0 SHA-256: 40c875e4b7309248b9b9cd9732f86a65e17728d6d6519565420d98f0a2e6f533
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting, and one specifically to a known malicious redirector. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy content into a shell, a common tactic for executing malicious commands. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://yafferge.ru/123?utm_term=android+studio+comment+code+shortcut In PDF document text
    • http://roboludawu.mywebcommunity.org/42701917627.pdfIn PDF document text
    • https://palanufijerovas.weebly.com/uploads/1/3/0/7/130739221/dogonopo.pdfIn PDF document text
    • http://dejepuzalew.mygamesonline.org/17221053078.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/virginia_woolf_to_the_lighthouse.pdfIn PDF document text
    • http://nekutijefaxikar.iblogger.org/baofeng_uv-5ra_range.pdfIn PDF document text
    • https://bobefenore.weebly.com/uploads/1/3/4/0/134016691/dijoke_mufapujeregu.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/xjiiige/sultan_of_tower_defense_air_forces.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/cif5haO/gubeb.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/kukomog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a1b1fdb3-9e79-4674-9d55-5cdaf838c557/20834391343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2999d8e-d6fd-40b1-aeef-3d9002f306ce/ruwumotarubeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8577212f-501f-4f8d-847a-57881389a9ff/the_spiritual_man_is_a_madman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b67bcb-c99a-4da5-b545-82e77ce4a6f9/quotes_from_red_queen_with_page_numbers.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_385b914fe87a4496919308c7e9dd3585.pdf?index=trueIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_efbb7095db39454abac8ee4b1fa21885.pdf?index=trueIn PDF document text
    • http://pujumek.myartsonline.com/el_amor_en_los_tiempos_del_colera_pelicula_completa_repelis.pdfIn PDF document text
    • http://zugoxovok.epizy.com/34316957295.pdfIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_a6cb09377c3b4eecb62a032e1079fbf2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4fcaaaa-832a-4b37-8b58-7587bafa90db/how_to_reset_yamaha_receiver_rx-v383.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 4808 bytes
SHA-256: 197d767467137c5b862e9fd9c23dad63e3c19ab701ad9d0fe1ecf48dd30bf178
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 11540 bytes
SHA-256: cfbf8820522e2df49925f3b82ababdd221b45c6ce3daadd0a6b1ce524cb03dbb
font_02_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e