Malicious PDF — malware analysis report

Static analysis result for SHA-256 b583df5fde889615…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 15:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ab405fa6cd79d0c658ace08652a816a7 SHA-1: c1b39220e45e6cf808f1140cb8f8d161e628674d SHA-256: b583df5fde889615276346dd9224f194bbdc989046457fdd0320780b479397bc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The embedded URLs and the heuristic firings strongly indicate an attempt to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=calcular+funciones+trigonometricas+sin+calculadora PDF link annotation
    • http://nukapag.getenjoyment.net/genetica_humana_libro.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/jeYjgjf/68736857802.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/TlxEiic/48270904212.pdfIn PDF document text
    • http://kaboliwup.mypressonline.com/99060676878.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/hjhjih3/nazumufupexakebe.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/zecharia_sitchin_free_download.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/vagelubasasapitujazu.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/iujdich/summer_pockets_reflection_blue_steam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_18765927a6a347a7932df9402f643f45.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_2a634110e13d42ac9bd24dfd0c756a19.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_879226ca4a8a4c6485563a17a32a09d7.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_3680a86e33cc443cb124cc99a9317f6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/goniruzinezovop.pdfIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_45a634d3bd0b4f259e9b1fd8eee1b9dd.pdf?index=trueIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_7f0911382d1441f5852f44b44ff1b695.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_de5f253898574a9b84ae6cca4a03c1aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remeranexe/43629083208.pdfIn PDF document text
    • https://151dec52-cf20-477b-a401-a68195eead79.filesusr.com/ugd/8538f4_f924dffbe99347c9be112f4e27a6f696.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_56cf4608700b4b6e91797912237f78ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/54781722262.pdfIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_f8d33cc739f24bbda08229cc03eac38a.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_213f457af80343658ea229a9a13b8b71.pdf?index=trueIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_a1e78fda3e2a46a091e834da4e6d3839.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/asthma_classification.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_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 5248 bytes
SHA-256: fe20ce4a1015b534ecea2a44076e32a20d45f6a05e5471c65d9ab740a17b32df
font_01_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 12192 bytes
SHA-256: c1b12bc80ec9a44096593a22d8b0acace1bde127de08593275c7584121be7143

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