Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52a4f82d005b487…

MALICIOUS

PDF

75.7 KB Created: 2021-03-19 22:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1ba966a5be248c90ded5f762902d66ff SHA-1: 5725699457e18e08354ce26284504667e356605e SHA-256: a52a4f82d005b48761fde5ffcdfae9c65d928f14e1c101f77ffa2360b45dee19
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://soxebez.ru/123?utm_term=flex+banner+design+templates+free PDF link annotation
    • https://fobafomenizu.weebly.com/uploads/1/3/4/7/134753661/4607a96.pdfIn PDF document text
    • https://bumibaniligaza.weebly.com/uploads/1/3/1/3/131383581/82212a75be0f4c8.pdfIn PDF document text
    • https://taralibupub.weebly.com/uploads/1/3/4/3/134372711/jokujunusuxovu.pdfIn PDF document text
    • https://tafujopebipa.weebly.com/uploads/1/3/0/7/130774972/xorilanugu-fovevuz-janewugujo.pdfIn PDF document text
    • https://woviximanikiz.weebly.com/uploads/1/3/4/6/134693880/simirar.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/safidar.pdfIn PDF document text
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/lotoxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ba3d6c-76c4-4355-bf8c-6229227146c7/21556475480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89abd30-4aaa-4127-9b83-7b28471140d7/soduxo.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_67de2097a0d3443f91b1430ae91d2da3.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_09d96e0b37ce446eac25b25b14152532.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/anime_violin_sheet_music_easy.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_f062924dbfc64a90ab9539d37be11983.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_e96d890c27c74d038a440de9dfbc9347.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_a09aeb2966f140c1baf50f8f304daac4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/33508145544.pdfIn PDF document text
    • https://673fcb93-492a-40d1-a7cc-77260b5c7816.filesusr.com/ugd/62d21a_b19d1d673dee4ee2b618e7fb6c2c85f6.pdf?index=trueIn 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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 5524 bytes
SHA-256: 7d6660783978164cf09fa7133db97d2710c5e39cc1cf1d77399e0456f63e14e0
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 10656 bytes
SHA-256: f7a39a7899353e194c10313954ffea503136e578a9a6ad84611c374059de7d94

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