Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38655d4f4f834a3…

MALICIOUS

PDF

78.6 KB Created: 2021-03-09 15:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc1dfe720ac8404f116a4acfffd26cdb SHA-1: 8e0b930303351409f76400ab6c7bb6cffc9914d0 SHA-256: c38655d4f4f834a392b152ac32523dc17de19b31f67ac68d786e9208f396a5ad
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://botokaw.ru/award?keyword=organic+chemistry+notes+pdf+free+download PDF link annotation
    • http://zonizubiro.getenjoyment.net/15133626638.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/12959437735dgkvj.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/buwese.pdfIn PDF document text
    • http://hookup756.fun/zojirushi_ns-zcc10_5.5_cup_neuro_fuzzy_rice_cooker_and_warmer_in_premium_whitenr7tl.pdfIn PDF document text
    • http://portkamesto.site/history_channel_alone_season_8p7ke1.pdfIn PDF document text
    • http://jigapenufi.medianewsonline.com/38811691231.pdfIn PDF document text
    • http://vowavosudepomu.iblogger.org/78017245756.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/cartoon_network_replay_apkttkn3.pdfIn PDF document text
    • http://baltika-trans.ru/20559302912bn6c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badokelo.rf.gd/wipexuwirebidonijopi.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_51174abb1c5c4648ac7b6a911c18ef97.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_99465f10d0d5467599449a80a33d9d0e.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_234a3dd405324e9da1b811f631fd0334.pdf?index=trueIn PDF document text
    • http://toridefe.rf.gd/vipenejusog.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/84392325355.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_2076661b19684bf28523a0a3f60b4e73.pdf?index=trueIn PDF document text
    • http://jemekeluvakowop.rf.gd/review_cobra_walkie_talkies.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_c4326f74c43d45a0b64cacca2ba02aa6.pdf?index=trueIn PDF document text
    • http://zukusuvajijip.epizy.com/how_to_remove_pimple_marks_naturally_at_home_in_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/rarimilogunutekusakir.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_c384d14c70a14e32bd82fdf72a4e7275.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_a908591c6bd24eb7942d33671a659393.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidivo/rixazepedemaxogaraxugoma.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_30dbfe4b347a4a1888bea3086bff214f.pdf?index=trueIn PDF document text
    • http://ginowane.onlinewebshop.net/68943490458.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 5788 bytes
SHA-256: 77d885a2c117414094ae02c862208c8f9329185084e68d64fd1c1dd7646378e3
font_02_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 10692 bytes
SHA-256: 66b3b3150ad07f5424b50cb8ebb03cb80a73db717f7ab27c16640feef1cf7372