Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b690e63d28f6816…

MALICIOUS

PDF

81.1 KB Created: 2021-03-03 00:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3d1200e6fe1e29fff424cc905a1c13ca SHA-1: da7ced5cc9a3a75f8d716f318258bd451b8be299 SHA-256: 8b690e63d28f6816ed498449622d5e00bcacc8e876fcef18fc303e20dc041fe5
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=wonder+palacio+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446161/normal_6027c1eb4bb24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5fce231355f5a.pdfIn PDF document text
    • https://tonuwuro.weebly.com/uploads/1/3/0/7/130739505/743d9cd378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_5fe63c675bbd3.pdfIn PDF document text
    • http://d-youtube.com/what_other_words_start_with_lyt47ui.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_5fe8ff5d9d17f.pdfIn PDF document text
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/rekofizexaxojema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_601e4843e442e.pdfIn PDF document text
    • http://maddot.space/black_acrylic_sheet_philippinest2t6r.pdfIn PDF document text
    • https://monibobur.weebly.com/uploads/1/3/0/7/130776122/bipawew.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/b7f9e35ddf2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_601b738616549.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/fizuwisapodizilalase.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/71234414331z95bc.pdfIn PDF document text
    • http://ellmax-site.xyz/377918324000aaxd.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/sepawi/ps4_keeps_making_eject_noise.pdfIn PDF document text
    • http://lubesugoninop.epizy.com/tamoxifen_dosage_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/cursive_handwriting_practice_sheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/xisulibix.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/limuzoniga.pdfIn PDF document text
    • http://gevotuwelu.rf.gd/ver_perdona_si_te_llamo_amor_2008_online_castellano.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/gipegotugag.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_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 5104 bytes
SHA-256: 85e0398bd25359e2c173891419ac5f81a478fe7dc02c4ab6133630646e4c04b1
font_01_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 15312 bytes
SHA-256: b96cef352a75ea7b046e7fdb7d8e1128aa6c3dacdd020dc061ef4360101fe30c