Malicious PDF — malware analysis report

Static analysis result for SHA-256 59733e94402a438c…

MALICIOUS

PDF

105.4 KB Created: 2021-03-18 11:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 498ae3ba06f5d172e7c818a4088b8840 SHA-1: 5d098d39d5fac7f5ae96acdec59713afe2b0e577 SHA-256: 59733e94402a438cb98874aaf9787f977ad3e9621cf25960b4643e684fe624b2
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, many pointing to disposable hosting or domains associated with SEO link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. The embedded URLs suggest a tactic of directing users to external resources, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=mount+and+blade+viking+conquest+story+mode PDF link annotation
    • https://pizewenijanud.weebly.com/uploads/1/3/0/7/130775868/totaponelig-nopiwotexi-vuxedazexelema-tepofixotafam.pdfIn PDF document text
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/rojapufegona-momisowepev-dabupisano-daropolitokege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_6021873d89699.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/gchdog0/dunkin_donuts_delivery_menu.pdfIn PDF document text
    • https://sitotibaw.weebly.com/uploads/1/3/4/7/134752740/fajazaxavitanelivofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_600ee4d8af03d.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/gaibjjB/fuel_tanks_iowa.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/40c8b55b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488807/normal_60026545b1e87.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/bDzZjeM/63802902524.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/lobidasepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380083/normal_5fcc0d51e34aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xidazeze/49482636270.pdfIn PDF document text
    • http://lumaradidufil.epizy.com/dynasonics_badger_meter_manual.pdfIn PDF document text
    • http://katemezutam.rf.gd/50192213406.pdfIn PDF document text
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_1d226aae413440e7af6a1af911e8b20f.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_70b5b6302bfb4eb58ca30e5b6778010b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/american_standard_s9v2_furnace_installation_manual.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_212fa63d2d3b4d4a9de8c1f1b34d15d7.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_e4e39263bf7a41cb98fbd3a2e57d32ef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C1 5640 bytes
SHA-256: b25ca3ce85bf2708165ee98e916626ccf6bc40c365840ca4466a01e4d8273387
font_01_sfnt_off000166e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E4 10388 bytes
SHA-256: 9e1d904fdcc10e508944d0ee2a9efa9142bcf0e29597b92f772b4ce5d32fef03
font_02_sfnt_off000189a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189A2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e