Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb3cdd5905c33e8…

MALICIOUS

PDF

70.6 KB Created: 2021-06-12 00:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f8fd459f607504f073758a5b14603205 SHA-1: 291f7a6a4890b4e6e81355080c735da622e26603 SHA-256: 1cb3cdd5905c33e8c6e68ad0d1f5b0c370b72f6403fdfba0c047416e2bb805ee
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/pbw?utm_term=laxman+mishra+ayurvedic+book+in+odia+pdf PDF link annotation
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/9155401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_6040ed324cd59.pdfIn PDF document text
    • https://rimudidux.weebly.com/uploads/1/3/4/5/134597050/supagafiwal.pdfIn PDF document text
    • https://dawozonejuveru.weebly.com/uploads/1/3/4/4/134489779/6237765.pdfIn PDF document text
    • https://gepulepefuxogu.weebly.com/uploads/1/3/2/6/132683228/mutabiwun.pdfIn PDF document text
    • https://xurufujes.weebly.com/uploads/1/3/4/8/134864067/rizufekekovas_kelopobidebi_wugikorokel_biroj.pdfIn PDF document text
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/573161.pdfIn PDF document text
    • https://bilidugudixuxo.weebly.com/uploads/1/3/4/9/134902455/lakokaviraxare_fixorukuzuru_sofakusego_bozukani.pdfIn PDF document text
    • https://weduxuvup.weebly.com/uploads/1/3/4/3/134308116/1285c468be.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/tumavogasaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5fe19b1949f6b.pdfIn PDF document text
    • https://wesiravanenuje.weebly.com/uploads/1/3/4/3/134385991/pimijusi.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/07216f11-c225-45f4-8834-4d6c2040ac63/how_to_download_accu_chek_nano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74250a2a-a074-4a70-81b8-a6d2cd76fa49/air_fryer_cookbook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c04ba7-b95b-4c63-919e-6ba83b024161/fisojefopazurex.pdfIn PDF document text
    • http://zutaman.pbworks.com/f/36248655723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2ac409-1135-446b-b5b1-d2dcfab45c03/how_to_check_your_hp_printer_ink_levels.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/xotipolupamofo.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_off0000d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 5740 bytes
SHA-256: 8b25bb8ff7eca8b0a5648c22584a947dce2be79792aedd82fed50169f00d3f0f
font_01_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 11444 bytes
SHA-256: 910ce1afd62670e8d6e8d86e4b744490072dd646f2d1a258a885ff23ff0601f6

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