Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e812bb96acc8e3…

MALICIOUS

PDF

86.6 KB Created: 2021-04-07 05:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 964b10b4e3b25c202974a1affe1855ac SHA-1: 2b73a11bfe602fc0ff4e0b34251552b4981d7f85 SHA-256: f0e812bb96acc8e35cc637546182ccbc129b920c163652d8e90c1491da5bdeb1
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to reference 'Bollywood movies', likely as a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://pelibifir.ru/123?utm_term=bollywood+movies+1995+to+2010
    • https://masizomomom.weebly.com/uploads/1/3/2/6/132681315/f6e869f.pdf
    • https://xizunobalik.weebly.com/uploads/1/3/0/7/130739811/fb4cb9.pdf
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5fda85b721174.pdf
    • https://static.s123-cdn-static.com/uploads/4470977/normal_5ffa32ee5951e.pdf
    • https://mujabimebedegi.weebly.com/uploads/1/3/4/2/134234846/zugupulatoxubagux.pdf
    • https://ramazupefedaze.weebly.com/uploads/1/3/5/3/135336263/5477654.pdf
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/8317436.pdf
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/9188661.pdf
    • https://cdn-cms.f-static.net/uploads/4382620/normal_6032a7c11c8d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wotidupodugi.myartsonline.com/31259911462.pdf
    • http://nofolimuri.myartsonline.com/all_aarti_sangrah_download.pdf
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_4f3c11fa62c74739872ba5a431cc441f.pdf?index=true
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_dec7d6393fd040429279f0a2c2a64702.pdf?index=true
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_9dcc54c589dc4aa9b21955d5c01a06c2.pdf?index=true
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_f39ce1788bc8468fad4bcb0225b3e0be.pdf?index=true
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_59d914c9dc594fd28cfc86038febc5b3.pdf?index=true
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_88745776b3f44456b206450a2fffdd66.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_775567f5720347179df7ba6056bd8f77.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011582.bin
25a8bcb9a0cc786f9659e300e8b6d447d4bcddb5a6998c314a9f5defe390a850		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 5576 bytes
font_01_sfnt_off00012894.bin
7fcfc884a5e91dc79004f29384434ddf2cd4e86139b625de4e865a3ce841e561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12894 10808 bytes

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