Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec522abc305993b1…

MALICIOUS

PDF

76.7 KB Created: 2021-06-09 04:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2b45d69fc13f830c8f6b0f2f7c25fa42 SHA-1: 52d49b0c1e7c6c54cef2d78a43b8b9f1a2e33468 SHA-256: ec522abc305993b1835672bb35ca4796cf411855e19db878c4082405b890c043
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The primary attack pattern involves directing users to potentially malicious external sites.

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://smidgel.ru/pbw?utm_term=light+transitions+premiere+pro+free PDF link annotation
    • https://sutofuwanunow.weebly.com/uploads/1/3/0/8/130874369/fatuxavox.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/pijopupi.pdfIn PDF document text
    • https://kolumamiwokuboz.weebly.com/uploads/1/3/4/7/134718804/jiderotobaferas.pdfIn PDF document text
    • https://vokozigaga.weebly.com/uploads/1/3/4/3/134316184/rekunixajorido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_6041c649e3777.pdfIn PDF document text
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/dovesuvoxave.pdfIn PDF document text
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/subuwumimukem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_604e74c6d3858.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/cb01f4ba87c.pdfIn PDF document text
    • https://gasibexagitusin.weebly.com/uploads/1/3/1/4/131408117/b6aba4b73a80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445888/normal_5fe02ee7069a3.pdfIn PDF document text
    • https://kenagikapafixop.weebly.com/uploads/1/3/5/3/135301514/4636619.pdfIn PDF document text
    • https://vilewojux.weebly.com/uploads/1/3/0/8/130874250/sefex_fikugom_nalusem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_604639b3560f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_60135cfd7ff1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_6018dfb7c9e7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482405/normal_5fee45518a8b7.pdfIn PDF document text
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/356671.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/2a5208e9-633e-44c5-ab1d-acb5d5438a45/67905910324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728e2ac2-09a5-4b42-abab-eeede3383e18/80352353066.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_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 5224 bytes
SHA-256: 4621571258e681435d317aab26a87fbdac17e0cd1a319927f1a0e67d6b893d2a
font_01_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 10644 bytes
SHA-256: 0f97bcc6d5983cd77275e6dddc3ff69dc156900717b27b431a4a1c712e179d49

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