Malicious PDF — malware analysis report

Static analysis result for SHA-256 42571270df3c26b7…

MALICIOUS

PDF

75.4 KB Created: 2021-03-03 20:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a36faef1d89998e459dc18375f93c66a SHA-1: 1444a87b9a603786754129011868bb36cb68df8b SHA-256: 42571270df3c26b7e0527775179be02b769af4883fc3503173e39955c03f5db7
186 Risk Score

Malware Insights

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

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 direct users to potentially harmful content or for SEO manipulation. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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://fokemale.ru/strik?utm_term=how+to+remove+lid+stuck+in+vessel PDF link annotation
    • https://tatujudipopef.weebly.com/uploads/1/3/4/6/134605081/tikatix.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/mosodavomoruda_xumit.pdfIn PDF document text
    • http://pedujagafena.22web.org/business_plan_template_basic_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/xRgdDjb/rugby_league_finals_2020_australia.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/25421755984.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/4460718586.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/xorimapow-kakifuk-gegejefi-domenewa.pdfIn PDF document text
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/2c49ea0bfbd452b.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/1702489.pdfIn PDF document text
    • https://gupexududoteg.weebly.com/uploads/1/3/5/3/135302954/segixe-sasilukomuwomo-biwejaje-gaxafufedoru.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/wupuri-dagezoxovaru-pujapufiniwud-zizibul.pdfIn PDF document text
    • https://gazoxawirola.weebly.com/uploads/1/3/4/5/134588870/7371581.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/gphfh7B/wibufujosutuzedupone.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/jaAjbZc/36169044028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwavubixuvavil.rf.gd/all_world_tv_channels_apk.pdfIn PDF document text
    • http://lisiguzaxupego.epizy.com/86690753316.pdfIn PDF document text
    • http://viwekamopib.rf.gd/392393843.pdfIn PDF document text
    • http://lawurukipajuxe.rf.gd/fukefenisewivum.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_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 5052 bytes
SHA-256: 56966aa70fdc42fe078780c5c524e624e39ee25c183cacdf5efbf4e20f0a3bd1
font_01_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 10656 bytes
SHA-256: cc8f0288cec1c2456c440637d2946a19e1c94faf45865953137a3ec283846d45

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