Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19cae58a7faf505…

MALICIOUS

PDF

77.6 KB Created: 2021-03-03 01:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cbaa74969bcd53005c101f4dac8d25b2 SHA-1: 4e0208680b52e89e98d98a3c1c6208ad8554f226 SHA-256: e19cae58a7faf505dec7dae470d5ddb32e577940d57c1757ecb2840e7b8260ec
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used in SEO link farms to drive traffic to specific websites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest the document is designed to redirect users to potentially malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=how+to+workout+arms+with+no+weights PDF link annotation
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/kegejegu.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/ggPnZvG/42377714442.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/9429059.pdfIn PDF document text
    • https://bowejobopuzepu.weebly.com/uploads/1/3/1/4/131406154/8884778.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/K6ljfaX/73261702926.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/8ZjcheZ/st_james_united_methodist_church_east_troy_wi.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/BFhiahg/when_will_new_york_and_company_stores_open.pdfIn PDF document text
    • https://fowajenen.weebly.com/uploads/1/3/5/3/135329448/fifomolebuz.pdfIn PDF document text
    • https://cdn.sqhk.co/wudajelu/eigjage/skins_cast_season_2.pdfIn PDF document text
    • https://verukutuxa.weebly.com/uploads/1/3/5/3/135330203/botazetusuvusufa.pdfIn PDF document text
    • https://fokikemapusa.weebly.com/uploads/1/3/1/3/131398543/rafixezadomiso.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/fuvidokibet/android_studio_test_keyboard_shortcut.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/66272562670.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/nenunevoga.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/new_assamese_song_wap_site.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_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 5184 bytes
SHA-256: ae530db347436f99eedf442d01eb768ac94f28d3f42ac8d5fcf23719861ad10d
font_01_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 2660 bytes
SHA-256: f25375f9d145506fd646ea1021c27f396c47852052a1f6b15c40731b26a60aa0
font_02_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 10096 bytes
SHA-256: b7beccb5753c96517a38e09e36e5190c6b7f31fcba1c32c90bc559e0be52448a

Open this report in the interactive analyzer, or submit your own file for analysis.