Malicious PDF — malware analysis report

Static analysis result for SHA-256 5520d4fa06e889ed…

MALICIOUS

PDF

108.8 KB Created: 2021-02-27 19:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bdbdfb192cc0350e4ca8203481ea7610 SHA-1: ecec8b32773410f607efc577d9f24b8b325d4597 SHA-256: 5520d4fa06e889ed994f189dd38fdb33b45d0688c182b12de0321766ebdfedcf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically highlighting the suspicious nature of the embedded links. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution.

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://fokemale.ru/123?utm_term=excel+vba+apply+array+formula+to+range PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489412/normal_5fd7d38ba7fbc.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/cuantos_cm_hay_en_un_metro_cubico.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/F2jj143/mlb_news_mets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601914bc89455.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/yggvjeB/amazon_seller_central_phone_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_6015b048860f0.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/Ogcjfja/automotive_engine_diagnostic_tools.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6016117d876d4.pdfIn PDF document text
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/cc04ea3f3da222.pdfIn PDF document text
    • https://bogizironafek.weebly.com/uploads/1/3/1/4/131406395/35b5803f9.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/zodoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/heuBhjh/10038008816.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/50603876027.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/HyyhhCX/2_player_games_ps4_co_op.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/jiZhdSg/junuderiwegin.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/what_is_one_world_religion_all_about.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/rHgeiaH/toruvibazigabefusipuranu.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/2701983.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/jgKhfge/qr_code_barcode_scanner_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fematixub/chfM2mu/carrot_fantasy_2_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/asm_fm_manual_11th_edition.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_off00016d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D5E 5484 bytes
SHA-256: 9238d5a6a102fef2b1194c58f3f3fe8f22f97fa76ff535bb97fc38809911deb4
font_01_sfnt_off0001800c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1800C 11024 bytes
SHA-256: b631584bfd1f612169e2ae43fc8850a84779b889afc4b3da12596b5e49a0ad39