Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1cbd18ceec352f…

MALICIOUS

PDF

92.9 KB Created: 2021-03-04 11:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fa2bf35b2a1efb6382c8464737dea2a2 SHA-1: 21f6c0848e00760795f606c62162620ba966e9f3 SHA-256: 3c1cbd18ceec352fc04b08186b5d526e1559fe66db624a4f5a83eb1270261327
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. One of these links, 'https://vilenefex.ru/123?utm_term=sony+a350+lens+cover', is directly embedded. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious content.

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://vilenefex.ru/123?utm_term=sony+a350+lens+cover PDF link annotation
    • https://molemopiwe.weebly.com/uploads/1/3/1/8/131856052/roxetor.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/5f0215f96443d.pdfIn PDF document text
    • https://tipizilij.weebly.com/uploads/1/3/4/4/134462633/fugev_mowamar_xugalepolar_vixufemudevamaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_600c8d3d77ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_6031f7e8ca776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_602ef01f75c58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_6005fc451ffa2.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/brighton_and_hove_buses_timetablepuczc.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/marimejerebo/88991877957.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/32956450402.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/drivers_ed_online_texas_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/wudevibigufugopaxonatel.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/traffic_rider_apk_android_oyun_club_hile.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/8428080480.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/xasulugevonozelaf.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/70571578922.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/49446577287.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/bully_anniversary_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/what_color_wires_go_where_on_nest_thermostat.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_off00012ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBF 5488 bytes
SHA-256: 6a7a875537990e32026b19c84773353f474e4bde9c3b17a2f0606871361f6de1
font_01_sfnt_off00014184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14184 11100 bytes
SHA-256: 04d52880aef1e541c2502ce3fe1b64ec694f2656f97ffeb692493a6973cf6326

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