Malicious PDF — malware analysis report

Static analysis result for SHA-256 932e879cf19ea883…

MALICIOUS

PDF

82.3 KB Created: 2021-05-23 12:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 781bf6dd38acb53bed8897ef993772be SHA-1: 894e77690bdc34f640798ea76c423f5f489c3563 SHA-256: 932e879cf19ea8836fad919318bf98a89db3b88b4315c4e7f368fe0c2ec218e1
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 0.9996

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://jottigo.ru/strik?utm_term=unity+3d+spider-man+ps4+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451225/normal_601c87ed1effc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_6063f45826a7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5fd650b8a7f24.pdfIn PDF document text
    • https://nadoxunerakabem.weebly.com/uploads/1/3/4/3/134378450/d6946d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_606e22e316cb3.pdfIn PDF document text
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/2378369.pdfIn PDF document text
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/xugese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_6033debd627d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fca762d22db1.pdfIn PDF document text
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/4393409.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/katejovoragubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_603cad8149dc4.pdfIn PDF document text
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/kivofoxeso_depovolaf_rokek_waxixaxadudasu.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/vaxegegoxuxod.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/3908ed7d-f18e-4c8f-aa33-902b5b6a4634/ronawinerasajil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ff0af4-4909-45bb-ab34-3f8463228c10/manual_bissell_proheat_2x_revolution.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/infinix_note_7_lite_price_in_ghana.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/gcse_pe_somatotypes_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/toto_washlet_s350e_installation_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 5636 bytes
SHA-256: 2e3de1661bfd4024f324145dca8bc80e03f96f6d02699c5aec5ce54b284911e2
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 2140 bytes
SHA-256: 3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4
font_02_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10328 bytes
SHA-256: 1f4c46838ae6295827cfdf5c6cba04ddf165cc89b83dcb06429ffe062d9fb3e9
font_03_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 17632 bytes
SHA-256: 1074e0847f1a9229779d3685f2cc15110c6ae673cb7479875ead5911ed7aff7a