Malicious PDF — malware analysis report

Static analysis result for SHA-256 684530146cd65c0c…

MALICIOUS

PDF

73.4 KB Created: 2021-01-22 10:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 369766ca2e5c32a3237f775baf99cb0e SHA-1: 52eec48139c9a7cc99d31f2d31f740eeb2f27aba SHA-256: 684530146cd65c0c67cba4992c80da09a7b5943843b07bfc7d29ae3f5c3105cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or link-farming attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=skechers+relaxed+fit+memory+foam+360 PDF link annotation
    • https://cdn.sqhk.co/rujuwawuju/gji4Fgh/16882560169.pdfIn PDF document text
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/kufogipapej.pdfIn PDF document text
    • https://wuluvaxezipow.weebly.com/uploads/1/3/5/3/135393263/gemowuvale-sidoko.pdfIn PDF document text
    • https://site-1217744.mozfiles.com/files/1217744/57550648505.pdfIn PDF document text
    • https://site-1178770.mozfiles.com/files/1178770/lilunebef.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/3ljfHKg/vida_integrated_health_glassdoor.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/QsBjahd/nubunenutudebebotod.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/vuxalirudidel/vaaste_song_audio_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/aweber_sign_up_form_video.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/50639073245.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/23897524710.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/82255556064.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/red_cross_blood_donation_parental_consent_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/17980421292.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/57240735303.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/counter_affidavit_legal_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/dojavazepevokudin.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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 6056 bytes
SHA-256: 355bd539ce9959cb2cf413c4b3f53777fe05e4c6b41bda7d325e5f56392f4fe3
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 10688 bytes
SHA-256: 2e5de6c44163cda09e9223225b0ee0cde26a1647f4a27f7e9c3ea010b9b03cf5

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