Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ff4de012fc8c1d…

MALICIOUS

PDF

81.3 KB Created: 2021-03-28 23:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3660ec28f4e5ff6844632ee0d98b351e SHA-1: 5b23db8cd480b93e9bf66d122eb8116bf9d47bc0 SHA-256: d3ff4de012fc8c1d91fab87dd41d5dd41f28c4e919962561904c53fdc6fe6603
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 0.9995

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://baarspo.ru/aws?utm_term=how+much+does+a+lennox+mini+split+system+cost PDF link annotation
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/731d345a151.pdfIn PDF document text
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/xexoru_roxibij_sitem_posesobimukegib.pdfIn PDF document text
    • https://pubategikosiw.weebly.com/uploads/1/3/4/1/134131453/2275768.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/c7cbd39f4f.pdfIn PDF document text
    • https://figidurilope.weebly.com/uploads/1/3/1/4/131452961/5411152.pdfIn PDF document text
    • https://vovasodakujex.weebly.com/uploads/1/3/0/8/130874601/gefapefogumepa-buramujavinez.pdfIn PDF document text
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/2769734.pdfIn PDF document text
    • https://laxigotugib.weebly.com/uploads/1/3/0/9/130969680/3017420.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/pazefufu.pdfIn PDF document text
    • https://waxukazo.weebly.com/uploads/1/3/1/0/131071095/6194801.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/zalomi/37399427951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbed4b4-11d1-4888-a521-bce9390c0a96/mamas.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_83f87562d9954f239a7dc17dd2391bea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7c06cf-4e95-4cd8-aa26-69c75a3c3143/american_harvest_snackmaster_dehydrator_model_fd50_30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd48aa8-5861-474d-a9af-4299448511d2/vazenuberuwexorefaxokad.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/sufigipo.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/massage_therapy_consent_form_template_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06df64a3-50aa-44fd-8bb8-a8062c1b3356/82006796738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b628da-7433-4bc6-bf1d-ea250367b4f8/kuzazuvozigosojufepurepax.pdfIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_e7fd67bbe75d41919cc78e35867f189f.pdf?index=trueIn PDF document text
    • https://2eb5e741-fe40-4e13-9a70-20af0821b154.filesusr.com/ugd/6cf56c_16a988fb91634877b99ff28e79a8791c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/floating_platform_bed_plans_queen.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_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 5324 bytes
SHA-256: 87acc39174dd73306661bf18ab30494abcf92646330ef9b23780d9c224900506
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10800 bytes
SHA-256: c92acdfff64ef1b32f9f99503d9eacd5d159487b6988950bd10726568ec791cb
font_02_sfnt_off0001298a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e