Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c418cc61db27ed9…

MALICIOUS

PDF

76.8 KB Created: 2021-06-08 02:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 91af2960bd9cda8ac6d5b84241086a6b SHA-1: 57e2f10b8abf684342c800162d516ad5dd018598 SHA-256: 8c418cc61db27ed9843b8fbcb7bfa2fcee7dc82b0b847caec30ebf5637808a3d
194 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malicious download lure. It contains a large number of external links, many hosted on disposable domains, and includes a visual download button. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/pbw?utm_term=download+wwe+2k15+for+ppsspp+android+highly+compressed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376856/normal_601ff8ed28756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_60617eda256ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_60b902ce695aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_604397c0af9cf.pdfIn PDF document text
    • https://gabejudunutulan.weebly.com/uploads/1/3/4/8/134887900/4ec56d4.pdfIn PDF document text
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/9156465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_6067d5622811c.pdfIn PDF document text
    • https://naputurezakir.weebly.com/uploads/1/3/4/4/134485320/346542.pdfIn PDF document text
    • https://nadazeva.weebly.com/uploads/1/3/4/4/134499610/6828476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_60581c5a14135.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/kunuwokemonemob-fobafitetuvuri-sigim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_6018688875819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478655/normal_5fe41e0599237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5ff2e252ba42e.pdfIn PDF document text
    • https://guvisine.weebly.com/uploads/1/3/4/5/134598756/veputadule.pdfIn PDF document text
    • https://newafiramolik.weebly.com/uploads/1/3/1/0/131070062/2154941.pdfIn PDF document text
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/34c398c3bca10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_5fd78d53168cf.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/c8ba24a7-e551-4647-a3ad-8814dd1fe9e4/mubibadetilukax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9b37ba-e8f6-4686-9185-a8430427eff6/how_to_find_wps_pin_on_canon_printer_mg2950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfca6335-a2d9-48fd-9435-2c639fe18ccb/29782399326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26f58b7-5176-4c74-9fde-9730fcb97072/65591429544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9dadd7-3564-4a7c-b62f-b59aefc05772/what_is_the_formula_of_speed_distance_and_time.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_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 6132 bytes
SHA-256: c589bb7d119b84931e5e65bd36c66876762a13595e192c811f87f68a9718958c
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 12832 bytes
SHA-256: 19615b76c1a4aa75c41e5eea1c0d07a8da18d9cf52a07a7197a28fdd5f95c3df