Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef7865b5c58386b…

MALICIOUS

PDF

73.9 KB Created: 2021-02-27 15:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 09496a51d73294e2106e292f683ef7a2 SHA-1: 431564e5c9788b621e4cf61e01ed815f51adf802 SHA-256: aef7865b5c58386b01796fb86c0f326dbea6b3b91ad5a2b7926fef5546fc0de3
156 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 PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of techniques used to redirect users to malicious sites.

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://kuzutuzo.ru/wix?keyword=cebu+zip+code+mandaue PDF link annotation
    • https://cdn.sqhk.co/towafeniruje/bBVLidc/my_smart_horse.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/gVgdVeK/songpop_party_android.pdfIn PDF document text
    • https://tajewarupimef.weebly.com/uploads/1/3/2/6/132681391/xilikemasamidan_godatovebaxixaw_legopusizinomo_sibudewizado.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/tulusodam_fejajix.pdfIn PDF document text
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/4306780.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/woxikebob-revoxefutimam-wudiwiwi-zuludenuxole.pdfIn PDF document text
    • https://ranixujofenak.weebly.com/uploads/1/3/4/0/134016935/kuxufasilo.pdfIn PDF document text
    • https://xupugafowepeg.weebly.com/uploads/1/3/0/8/130814457/338ca4d9b72a2.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/3830214.pdfIn PDF document text
    • https://cdn.sqhk.co/mawedabe/hghRCge/70428255349.pdfIn PDF document text
    • https://rulipowijipej.weebly.com/uploads/1/3/0/7/130775545/75cf03.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/rivazixexuguri/good_follow_up_sales_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/animoto_video_maker_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/49067976830.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/wedokanegivebog.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/surixumugunujuzuvizi.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/70187169531.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/pesaf.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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 5008 bytes
SHA-256: 23b89132af93da4e3a8668de79b74cfb4fadf907752ed4c711b12eb032d2f5f0
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 10476 bytes
SHA-256: 7037449f6353926aee2c298a33a702288f6693db74a70c9f118693fe9bc3ceb4

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