Malicious PDF — malware analysis report

Static analysis result for SHA-256 b163c9c55aedbd9e…

MALICIOUS

PDF

75.3 KB Created: 2021-05-01 23:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 11a251e95bac3cf87c78cc82342dd0fd SHA-1: 426b4589e5e4de77839b5700bf9bfcc0c6f14b80 SHA-256: b163c9c55aedbd9e5baaebe95643c7fb6089d64d6a89767384a81cf3a586bf7c
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://resalured.ru/strik?utm_term=drow+of+the+underdark PDF link annotation
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/5260242.pdfIn PDF document text
    • https://penabapemuzoji.weebly.com/uploads/1/3/1/4/131453208/f63284d.pdfIn PDF document text
    • https://wuvipovuzodex.weebly.com/uploads/1/3/4/8/134846945/5565399.pdfIn PDF document text
    • http://hookup666.site/17353566763tevzu.pdfIn PDF document text
    • https://xalemutaxites.weebly.com/uploads/1/3/0/9/130969461/7414814.pdfIn PDF document text
    • http://slamelina.website/estructura_de_lewis_ejercicios_resueltos_3_esoe34x9.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/pneumonia_bacteriana_tratamento.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/embedding_a_gif_into_a.pdfIn PDF document text
    • http://arnautmebel.ru/lather_and_nothing_else_packet_answersemtzu.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/79247517399.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/dasowogupotobgpjc1.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
    • http://safedoguno.onlinewebshop.net/miwifogefopima.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/90856724595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b748a546-aa84-4587-9dde-5a757e89bc74/fufemimefokiweboragisivux.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/wasoxosukimofiwajejanifev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e97fa5-d8b4-43a0-9992-1ca6ad5ba51d/biragizojigiwev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48aa03a2-5e67-481f-96da-a4d7ab2c54dd/37450796767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc6dcd4-491a-4c6a-906b-cf73672e6f1e/which_is_the_best_series_on_netflix_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d432ae0-4301-48cf-8605-fc1f047df093/bose_acoustimass_15_instruction_manual.pdfIn PDF document text
    • http://wipibefab.onlinewebshop.net/i_robot_full_movie_in_hindi_2004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed7f5d77-bd0c-492b-aba9-0d3527debcf4/giribofusurorob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0a7840-1ce2-4fe5-9c2f-55c8575b7d9e/xakibosoxafufuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2184a94f-f518-4726-8fa6-9fc5ab3c3337/fit_for_life_book_principles.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/sopovurakuxev.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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 4772 bytes
SHA-256: cb508f5b453f5b17203ed73cd63742f60b5c9e3808bf3e1b82c61035b7dd3db8
font_01_sfnt_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 10892 bytes
SHA-256: f885028984ec656f8ebea74eb0f1ef09deee1a7596755d3a4813aca8b20ee70c
font_02_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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