Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e69be5db99c847…

MALICIOUS

PDF

77.6 KB Created: 2021-02-23 04:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ecf07f982ab6dd7246b3992bc7548383 SHA-1: 11fb4668285c4a8980191065af12aa4bc8429dc5 SHA-256: 59e69be5db99c847c9015d1612ff7b9b60d72c07d60a35aaac35020fca9b0b17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://jacksth.ru/aws?utm_term=what+is+the+zip+code+4+digit PDF link annotation
    • http://datingsexchat.site/rational_numbers_worksheet_7th_gradehnfo9.pdfIn PDF document text
    • http://wegansit.space/ejemplo_de_semblanza_biograficalejun.pdfIn PDF document text
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/vaniberufow_jigulegunob.pdfIn PDF document text
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/57896ed04d370c.pdfIn PDF document text
    • https://kukaweferoba.weebly.com/uploads/1/3/4/7/134754127/murozapoj.pdfIn PDF document text
    • http://robolab.one/unidad_informante_definicioncn9z6.pdfIn PDF document text
    • http://italy-small.space/finotalizizsgqeo.pdfIn PDF document text
    • http://ukranews.site/81004380429044vi.pdfIn PDF document text
    • https://dijodiruji.weebly.com/uploads/1/3/4/0/134097483/rokej.pdfIn PDF document text
    • http://bipogumaguwe.22web.org/66482075195.pdfIn PDF document text
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/widarifubumizevufipu.pdfIn PDF document text
    • http://milanbeach.fun/nigeria_navy_2020_salarya7d5m.pdfIn PDF document text
    • http://callup.today/arunachal_pradesh_map2bnkv.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/zifozujiwi/zurujeg.pdfIn PDF document text
    • http://xugibomexepef.rf.gd/21948110301.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/88803620605.pdfIn PDF document text
    • http://mojadifo.rf.gd/polycarbonate_injection_molding_processing_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 5040 bytes
SHA-256: 017137198d949aaca5bd884346c8636525bf1eb8eb778f456905919ac75ff201
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10588 bytes
SHA-256: a02903578f6a0c5f058729b9fb18f36014994b56de229657a807fc5e892743b7
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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