Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dd11d5d9593604…

MALICIOUS

PDF

72.1 KB Created: 2021-03-19 04:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9ddcad58b360d0216ebfd14c4d4034ae SHA-1: d38ed9035375177a69d5bc21ed6f65792a15de25 SHA-256: 57dd11d5d9593604806879e807bba183dff7c417362d0fc0536b0fb646f3105d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with a high ML classifier score and ClamAV detection. It contains numerous external URIs, many pointing to disposable hosting, suggesting a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/aws?utm_term=the+pact+2003 PDF link annotation
    • http://resokipuga.getenjoyment.net/citing_a_in_mla_purdue_owl.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/hgdZXjc/am_fm_bluetooth_radio_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/9ryAOFn/mogavufejuzu.pdfIn PDF document text
    • http://potenciy.xyz/ethnography_project_examplesxlvfa.pdfIn PDF document text
    • http://tekplafond.xyz/audacity_download_mac_10.7_5kne7i.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/I7habC9/hit_the_roof_meaning_idiom.pdfIn PDF document text
    • http://bodyita.space/sifigidekitonotuxexahrkbk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://julisanusifi.rf.gd/69925681997.pdfIn PDF document text
    • http://botovomevagexe.epizy.com/red_light_district_seoul_guide.pdfIn PDF document text
    • http://wazinupizut.epizy.com/76446567110.pdfIn PDF document text
    • http://tibepaxun.rf.gd/dr_dre_beats_wireless_solo_3.pdfIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_980485bb20bf46bcaec09ec6470c489f.pdf?index=trueIn PDF document text
    • http://zedowep.atwebpages.com/tifotesulunirudemonasep.pdfIn PDF document text
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_d5067d35e616432f90d21598f637ec7d.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_aa25e1a795024b6cbce6769ba27f43c0.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_90dfdb3c2561462784b47b6f5f014bd6.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_8f31a995d88547279c2a8aaaff099509.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_adcd75d53aa54599870d067de7f24d9c.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_277f99cfaaa44eaeae0c2ef629a16e31.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_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 5100 bytes
SHA-256: d16d47a24b8492a19c4e5a8ac6420218f33d0d2bb42af577461a10b90cb290c9
font_01_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 11892 bytes
SHA-256: 190a0e02630cf931e3503ad767888d40b5003f484751ff08f8e75f5a95163918

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