Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f37fc3e44be492…

MALICIOUS

PDF

110.7 KB Created: 2021-04-04 02:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ee96d47b3c96a4ed9d219eb1f2ff02a SHA-1: 5a9f5ef8969fe5f26625ba22a31f7f7fb498601d SHA-256: 56f37fc3e44be492e8991112f01915fabda6de39f2360b97e89107c2a07092bf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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=nom+coliformes+totales+pdf PDF link annotation
    • https://cdn.sqhk.co/dinigivo/kXFiahj/coc_th10_bases_with_links.pdfIn PDF document text
    • http://kikifikoxije.mypressonline.com/xazidorasam.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/gubuwolagozava.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/how_do_you_fix_a_black_screen_on_a_hitachi_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/bge4Zhj/76279649927.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_bb7418370f46401e806f700251783f90.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_3808f668576a4e18b59c613a12edc8e7.pdf?index=trueIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_f3b7463fc050455c966df260e493ea62.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_04b9ed1eb85246ef8a7fd7c5aaf30ebe.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_e13e3f093ae1402ca7741942c7d097a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28bf7f2e-d712-4d10-a32c-fb6bbd384715/hoover_windtunnel_2_rewind_belt_replacement.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_14f223ac20da4ba38a2b8de72f5014eb.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_7000e539e0364164a09c98420a9f0f35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4177b9fc-8dc9-4929-866d-b9da75fd1064/baofeng_uv-5r_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7763b642-eea3-4eaf-9e77-a8101af8af59/what_does_it_mean_when_service_airbag_light_comes_on.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17147 5268 bytes
SHA-256: 83054414fdfcd9989c6dc1e616816d5b2c413b1c8fb652a88bc45e5c7587a174
font_01_sfnt_off00018326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18326 12580 bytes
SHA-256: a5cfb223149a34911ca81c8084b53307ce5212ccd0fba4ec1476c3f312572b11

Open this report in the interactive analyzer, or submit your own file for analysis.