Malicious PDF — malware analysis report

Static analysis result for SHA-256 9123ade2941050b9…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 10:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: fdcda6165677e93b6ca8066fcf8a7f43 SHA-1: 506e85b8fb196d35e49f5c32a600794c6a587123 SHA-256: 9123ade2941050b959f027718713d40537a3159d04a15c44fb9949c24e09bb54
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm for SEO manipulation or to distribute further payloads. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests a potential for downloading and executing secondary malicious content.

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://midufefew.ru/wix?keyword=king+black+dragon+guide+osrs PDF link annotation
    • http://tunewejewuz.mypressonline.com/us_median_household_income_2017.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/rulodoruram.pdfIn PDF document text
    • http://tradestaroffice.com/99862917174kj11m.pdfIn PDF document text
    • http://shoop-ff.ru/cannot_open_file_d3dx9.lib220qs.pdfIn PDF document text
    • http://nubolats.xyz/how_long_does_a_2004_crown_vic_last723xm.pdfIn PDF document text
    • http://fruit-italy.space/sexuele_voorlichting_1991_full_moviedp4go.pdfIn PDF document text
    • http://erogan-columbia.site/x-plane_11_garmin_530_manualizypi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_62f6f7af3bfd44b6b9d997bef702108e.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_364c107efd704cd6b2d655b7cc09c245.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_b692c940c67b450e93d30072f8a55346.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/cubase_5_full_software.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/year_5_maths_decimals_worksheets.pdfIn PDF document text
    • http://gajamozaxekega.atwebpages.com/78590885365.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_6661dd47c58e41e28f4030373d017685.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_79bce2f0b4d04cecb971a44f215c0fdc.pdf?index=trueIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_4604115617424d77b1e45400690c5016.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_5eb916122d4246a483ea3aaa2f083b2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/how_to_calculate_wind_turbine_efficiency.pdfIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_d6888a3f4e18488a9b6103b812f3330e.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_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 5280 bytes
SHA-256: bae32da22868b52f26b3b50c9081439ca13f6b50b2afbfc6745fd8ac444db22e
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 10544 bytes
SHA-256: 93a18e5bce1c142566bb4f0dcd3a6b6cd5ca9c35c92cb414bfb34649467cddef

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