Malicious PDF — malware analysis report

Static analysis result for SHA-256 23510a21343ebfb2…

MALICIOUS

PDF

72.2 KB Created: 2021-04-04 04:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e976581f50cb8144bee275615853007a SHA-1: f4426cdddf1a51595604fafa86c86b84b3bbd435 SHA-256: 23510a21343ebfb2523abe0523ecc3542cef8a4472837bac57e04ec2e9a8eaf3
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, many of which appear to be disposable or dynamically generated, indicating a link farm. The ClamAV detection and ML classifier also flagged this file as malicious. The embedded URLs suggest a phishing or SEO manipulation tactic, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7696

Heuristics 5

  • 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.
  • 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
  • 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://gimoguvi.ru/award?keyword=subject+verb+agreement+worksheets+for+grade+6+pdf
    • http://zizodoroluxonaf.sportsontheweb.net/how_to_install_focusrite_scarlett_2i2_on_pc.pdf
    • https://xufujume.weebly.com/uploads/1/3/4/8/134851049/sunetasog.pdf
    • https://zobuxojakaxux.weebly.com/uploads/1/3/4/6/134690110/zodonaf-vimotebe-nozabekepi-xemojogenub.pdf
    • http://pebunoguge.mygamesonline.org/48969611586.pdf
    • http://tufinanegonaj.medianewsonline.com/dumovup.pdf
    • http://finuxezanasa.mygamesonline.org/how_long_will_a_boiler_last.pdf
    • http://xuxikurov.mygamesonline.org/how_to_convert_file_into_cdr_format_online.pdf
    • http://pogawubujogeje.mypressonline.com/kagutiwifidedolava.pdf
    • http://fosireditoj.mygamesonline.org/semonabofabesamaxox.pdf
    • http://tuzojexis.mypressonline.com/abordagem_humanista_na_educao.pdf
    • https://dezilupogebog.weebly.com/uploads/1/3/4/1/134109094/givunad_gajagoxabarewil.pdf
    • http://gagogepatajebe.medianewsonline.com/49108413294.pdf
    • http://wozilimesiz.mypressonline.com/rawebevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fikelamizogu.myartsonline.com/7526475487.pdf
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_9bd0b9610505453ab45f1b6e2d8d5f07.pdf?index=true
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_23d76a8535e140beb546927cafe4ca55.pdf?index=true
    • http://xomutojekes.myartsonline.com/boston_t_map.pdf
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_f21efca47a6c473b9ea88f9edd037820.pdf?index=true
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_d4897679d7024abd8c8ce1115e4ea41f.pdf?index=true
    • http://nuwadolonopip.onlinewebshop.net/early_capitalism.pdf
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_4b0e4ed5ecfe4ae98eeb8d31a0e85ab2.pdf?index=true
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_8468ee35f6a54bfabf79b440087f5942.pdf?index=true
    • http://tuzuxutetug.atwebpages.com/88346945735.pdf
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_c19e7b071a95459d8e10c04a944ce712.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6e.bin
5d9ed791dbf7d4e4e343bdb84daa98593ff1ff689d70a43259b2c774eb05c83c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 6228 bytes
font_01_sfnt_off0001038c.bin
46606a60be99280617f52e61a3fe23ecfb7cc3ac167431303c2bde8790810fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 10608 bytes

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