Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d91a01aebecef3…

MALICIOUS

PDF

66.7 KB Created: 2021-04-17 14:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 505cadbf8f749c9f44582b816a2f74f2 SHA-1: dc63051dc72f911375f23203b42fef31db606ae5 SHA-256: 48d91a01aebecef3f641d90de31b23a22977fd1742c2c7c9b1948086e2dd745b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to external resources, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://dugedepap.ru/strik?utm_term=vanity+fair+bra+76571+walmart
    • http://zipubezexupoka.mywebcommunity.org/honeywell_programmable_light_switch_manual.pdf
    • https://xilonoro.weebly.com/uploads/1/3/5/3/135314978/bazamenaxif.pdf
    • https://jadipiruw.weebly.com/uploads/1/3/0/8/130814676/2784519.pdf
    • https://zepemotofilizag.weebly.com/uploads/1/3/5/3/135399015/janatosu-mikuji-lulofo-gomogorase.pdf
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/d9a5ef4.pdf
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/319818aae80fe82.pdf
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/1024155.pdf
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/puginesole-bevep-xawavolutuxuv-dogonizudejaka.pdf
    • https://cdn-cms.f-static.net/uploads/4470698/normal_6064dba2742e9.pdf
    • https://cdn-cms.f-static.net/uploads/4403960/normal_60403bf6309c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kipejefanowisu.atwebpages.com/duniresuxaru.pdf
    • https://uploads.strikinglycdn.com/files/29a4ac81-2f6d-4ba6-bd36-b0c24b0c2ba0/fabuwezuduk.pdf
    • https://uploads.strikinglycdn.com/files/eaa9f1b4-8bd8-4920-90a3-4591fe14a16b/dikofapotumaxuzadil.pdf
    • https://s3.amazonaws.com/tixedujegibex/the_happy_body_plan_alexandra.pdf
    • https://s3.amazonaws.com/wupixufekijax/23117252782.pdf
    • https://uploads.strikinglycdn.com/files/3b2835c2-d526-45b7-9ecd-96546fd14b86/the_book_thief_movie_summary.pdf
    • https://s3.amazonaws.com/wozoxub/sajokujojedilizajusurimu.pdf
    • https://s3.amazonaws.com/votawawo/7098549234.pdf
    • https://uploads.strikinglycdn.com/files/5537834a-8cc4-4e58-8b7b-f3168c490528/lobakawisutupeb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c81e.bin
52748b16df845183d6b89dc17a7bad591b2d280aeb125a775f9a768d9a90876d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 5444 bytes
font_01_sfnt_off0000dac9.bin
37f8e660b98e461ae4a072983aa298d6c104d8b4045e39d489cc33681a038b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 10244 bytes

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