Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e0c5a5d235b4bb…

MALICIOUS

PDF

135.3 KB Created: 2021-04-10 11:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2721c5eb09b5591427754c15db9e0878 SHA-1: aff729b555f0f759b7ccc7890a026f30d9a077a5 SHA-256: 76e0c5a5d235b4bbbc4e472f735f60119b2fa80d91913c158cd2280ad3246484
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=how+to+connect+wireless+headset+to+cisco+ip+phone PDF link annotation
    • http://blaugrana.ru/video_editor_apk_latest_versionswhij.pdfIn PDF document text
    • http://bluebadge-support.com/agentes_y_apoderados_aduanalesgnvhm.pdfIn PDF document text
    • http://bioforcecolumbia.site/51853205390s1ar8.pdfIn PDF document text
    • http://baykamif.space/69099107522pt477.pdfIn PDF document text
    • http://sellforce.ru/zomopogaforowokxrlr.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/f8e52c95c1de.pdfIn PDF document text
    • http://businessoutsourcing.org/nuzunomunapegax1e0ir.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/11208485659auk6t.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/rajapara.pdfIn PDF document text
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/cfef9de0.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/sukamolimasesosini.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/af73f614-07fb-4a94-804f-7f40c381f053/65444397841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85388b4f-994c-4731-9e17-081d7b892e23/24974101587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f352c1c9-3676-436d-891a-bdf81b2eb38d/mofimunorefuvefedoberuju.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_fa0bb3ee091940e3b465ec53be995451.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6fcadf2-d707-4ead-a649-afc3e18b35b8/52966586790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83aff46-79c0-4a2a-9613-8856cb5dd971/candle_magic_low_flame_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258c7446-ac19-4335-a031-737762233ce7/line_6_spider_iv_30_clean_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9d0fee-cee2-4fa2-80d0-35f4487a95c6/crossfit_workout_log_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e0b681-d135-4c32-9f11-b237e3ae9962/vadepesonedupagiwenovalog.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_1feda7e729ca446b9ead2d24049e8529.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D749 5212 bytes
SHA-256: ea57590f97e19a5d3589f3d10920950a94f3fcfd5845f6674a3b162ccbb9a13a
font_01_sfnt_off0001e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E90B 11220 bytes
SHA-256: 5f64eac5f1a81b0cd0a6755ba3b281509f33859f1455350684e8d100d2dbbb04