Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61113e027a92697…

MALICIOUS

PDF

79.5 KB Created: 2021-05-03 04:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9f5373552d19aaa945e56a1073514e86 SHA-1: b2737708ddb25d7af4d2b85e20fa84e9cacb87d6 SHA-256: a61113e027a926976bf72abac214586f20f714fb2ee363ef2234244e58f4dbdf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

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://xajibur.ru/strik?utm_term=cat+in+the+hat+movie+review PDF link annotation
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/4807870.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/ggcnhjy/background_video_recorder_for_windows_10.pdfIn PDF document text
    • https://lewobagapu.weebly.com/uploads/1/3/4/6/134666085/makezotogudu-kolovunimelin-jexijaseb-mozax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_60116e2dcae4c.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/aO2P2gc/33017966751.pdfIn PDF document text
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/wuxos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5ffb83080012d.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/nagaf_mirogavipoxojor.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/cab218b5-f028-4077-ab0a-1bb0d8c88416/tafujuvodutiganit.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_13af89dce6a5430bbb05e609a3a5c86a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/368c12d1-d0e1-4f25-b243-70a46ccc3ff6/dir_655_als_access_point.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_1b08512338d64c46be614ef18b87fa78.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_396deb3a272847a0af65b031edbc5040.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94bbb07b-7e41-4a76-8237-782f5eb617e7/14609423322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea07f40f-ecb0-4361-83ba-2361d625b06b/white_rodgers_digital_heat_pump_thermostat_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aadbd28-4b9d-4e18-85fc-a33eaa085922/how_to_factory_reset_gatehouse_lock.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_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 4772 bytes
SHA-256: 667292e5e1930b5c680cd51959fde4d8dc0716274cd277a880db29086425b024
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 11240 bytes
SHA-256: a2d9dbd905bf6e1d353160ceb1e9d53ba8b2d4d0986b961ceecc2c0adf52d6df

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