Malicious PDF — malware analysis report

Static analysis result for SHA-256 553b36ab853b4a46…

MALICIOUS

PDF

74.9 KB Created: 2021-03-20 05:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0ef0da46102cfbe741d84ffb5f5072a4 SHA-1: 7f2b9848437a731d44eb3147e883504a3cb20e09 SHA-256: 553b36ab853b4a461e85719e22ac6b4600c73b40363d7db7fdc81f9d4f8cbad7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious activity, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=how+white+tigers+protect+themselves PDF link annotation
    • https://xapovakugad.weebly.com/uploads/1/3/5/3/135393008/0b9ff26c9ff0b.pdfIn PDF document text
    • http://ijmalan.xyz/68845752499oczdq.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/what_kind_of_jobs_can_you_get_with_a_wildlife_biology_degree.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/sekozudoguxuva.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/53984640512.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/variburar.pdfIn PDF document text
    • http://probmake12.xyz/how_to_change_docker_port_mappingypl27.pdfIn PDF document text
    • http://seamanygau.best/41661987097c7ghk.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/fugazufodeka.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/gifekixoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/bugs_and_taz_time_busters.pdfIn PDF document text
    • http://bibikefogive.epizy.com/faxak.pdfIn PDF document text
    • http://mujozigimak.rf.gd/laxififoga.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/unitypoint_clinic_express_care_-_north_port.pdfIn PDF document text
    • http://vananoxozonu.epizy.com/41871644680.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/69255803034.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/diplomatic_reporting_in_journalism.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_3d35227b8383453f932522a8e44b3103.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_eae1fc06f5a9450c8ff27863fdef428d.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_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 5252 bytes
SHA-256: ae11e3986379eb8d1d9301949afa6b91f89be4913f781da1219c7dc547df17f7
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 10124 bytes
SHA-256: d643fb616950829745bd5d61f0c9e93dbf76ced6ed8ce6c9aa6c14b92c0e45b9

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