Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd01b331e3d59e2…

MALICIOUS

PDF

73.8 KB Created: 2021-03-14 03:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a024912428e7a53b5e8dacd9f38edd3a SHA-1: 00bcb7d8681e820f14f96f4eed6ad0527db0dbd8 SHA-256: bcd01b331e3d59e2f189d08958836cf1d67f59a54a6508b40fb717ed8b3e89b5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. This is supported by heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. The embedded URLs suggest a redirection mechanism to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://golowaki.ru/wix?keyword=st+dorothy+catholic+church PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498345/normal_604cdb71de67d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_5fe713e75a3f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_6021291a7e181.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/hhb94ha/forbidden_lands_gm.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/ageigRa/itunes_for_android_galaxy_tablet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_604cff8cbba75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5ffa38a9cb7a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445750/normal_5fc6ff3a1c9b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449183/normal_5ffc846a6e12f.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/GNjejaL/lenovo_laptop_charger_walmart_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_600a10fe892fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427313/normal_5fe40e2fe022f.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/gciaNib/wonexasezorenomupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_600d363151ce7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52ce55f-d30b-4fde-b175-8f412be9c228/44120228141.pdfIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_2a5dc11d5cf54ae4a0e81270505f8115.pdf?index=trueIn PDF document text
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_d96caff0973e4b748e8efa73b51b69e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20897fbd-ef07-468c-a6f4-e9e58ba16c13/remikopi.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_8857adb1f2f2409696ab9e7a9c1cd20c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ec3830-4cbd-4f85-ac84-e20fd85b7944/does_elgato_hd60_s_work_with_mac.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_c529f6b5e2954372b83a15c2253272b4.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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 5052 bytes
SHA-256: 589d14e7353100a9651190cc4e730c162f6e86dcbdb041155e155fd6ecb0bd3b
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 10944 bytes
SHA-256: 502f214a482a2e92d5428420dbfe502dab70582424c18bd5a0ba54c87289e551