Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52ae8fcf2185a7d…

MALICIOUS

PDF

76.5 KB Created: 2021-03-09 09:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3d1cac3738ae0e547545139ed7ceaf73 SHA-1: bd0fa8ca4688abfb6cd39d21b4fd3af0ce0c289b SHA-256: f52ae8fcf2185a7d169592b7d0252db88408259eac137ab6d71116cc0333c1de
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://resalured.ru/123?utm_term=civil+service+benevolent+fund+application+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fe404202c3e5.pdfIn PDF document text
    • http://esplus.pro/329638939405fldk.pdfIn PDF document text
    • http://maturibcgj.space/67247970298sg0dv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_602c337c81489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492245/normal_5fe3bfc10874d.pdfIn PDF document text
    • http://copyrightviolationcenters.com/05_jeep_grand_cherokee_brake_light_bulbpbrr9.pdfIn PDF document text
    • http://itdomen.fun/422580349029zo6u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_601420fc224ce.pdfIn PDF document text
    • http://veronaital.space/letter_sound_recognition_worksheets_kindergartenhes90.pdfIn PDF document text
    • http://luminar2-download.xyz/59474429451tswl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455198/normal_5fd84a48504aa.pdfIn PDF document text
    • http://shopwithsale.website/34810197712nwoej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_d7d283b55f1349f3a85c017950c1faf4.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_7d9aeec137b04966b41d6dced072d452.pdf?index=trueIn PDF document text
    • https://8218869a-5f01-4970-b441-d662873031c2.filesusr.com/ugd/99b222_f5af96b34a994695a5a97f7d18353116.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_ec9cd0838022480596a1e2274fef8d44.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_9cd63d3cf9d04d52a4a09b3665bc41f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gusule/59483148406.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/53324234961.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_edaa1d14b5d742e4b33e980ef253e4df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/2577831647.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_2e8b5dbc8aac49e69dc769cb710733c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/78023441520.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_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 5408 bytes
SHA-256: 571c85663d64edea8728aa45de6c59202a83597576ac193fc7ff34e08a8be19f
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 11224 bytes
SHA-256: 7d3b6cc31c95ed4ae9f3bbec8b1d874c8e23e92af1bff571dd8f09a9ff1b0085