Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c58cebff46920b…

MALICIOUS

PDF

87.0 KB Created: 2021-04-05 10:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 14211963c33a09f5f956e79219cf51cc SHA-1: 917d35d440c93ec55ff890cc7e24bade4c9b83bf SHA-256: a7c58cebff46920b7513c9bfecd366e2722f39984484e43e9948f883c127ea4d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9993

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://vilenefex.ru/123?utm_term=carrara+oval+queensland+stadium+pitch+report PDF link annotation
    • http://microbladingeyebrowsdallastx.com/briggs_and_stratton_carburetor_repair_video3bg29.pdfIn PDF document text
    • http://card2card.live/raid_shadow_legends_pc_and_mobile6e2uw.pdfIn PDF document text
    • http://trokot-online.xyz/kimuximuliwb2p2j.pdfIn PDF document text
    • https://xamatetafuxu.weebly.com/uploads/1/3/1/6/131606968/58fd065715c458.pdfIn PDF document text
    • http://konsalting.info/188697085244306a.pdfIn PDF document text
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/mimok_sunuve_jimepolugogunal_xebazura.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/94150463165.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/dusined/performance_appraisal_goals_examples_nurses.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/how_to_attach_dishwasher_bracket_to_granite.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_51a3e907be324e10b89a1e07023367df.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_96ee473925ac4db3844e996e3963e471.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_58a0d43e940945f791750a12cd22c5c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/14279457000.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_4665a9a756924ed4b3e5e55a8cde0ee8.pdf?index=trueIn PDF document text
    • http://gosaduzunake.myartsonline.com/edgar_allan_poe_works.pdfIn PDF document text
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_6be58662e08c41958b91475c573cbb85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/bergamot_essential_oil_doterra.pdfIn PDF document text
    • https://4fd7ac12-06e8-439c-96a9-7636004ccb32.filesusr.com/ugd/9554ab_c20e30f9c7a449dcb0e61ce3cf005bf3.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_abf5a922117848e68823ad67acc15308.pdf?index=trueIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_44a26e0d57364d858fd30b31acc8d604.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_0c4853b53b1e40848b9d8e153788dab6.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_e41a791d0cbd44c69e941854dff34528.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/rebobitixeduletozexifa.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/firefox_focus_privacy_browser_apk.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_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 5404 bytes
SHA-256: c488dca54e744944c4ebf9e88ea91932e74059f94cb4f330c61189bc74b18bba
font_01_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 11420 bytes
SHA-256: c010c04311f7b70094b6a5e791ad904628ddc94ab2f8f9fc24e23663bc039fed