Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7095464616d2fa5…

MALICIOUS

PDF

81.4 KB Created: 2021-04-01 17:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ab37621303c884513dfd8c37616c0fa SHA-1: 30e39aa9277e605bed64ee5e0b427845e7c723b9 SHA-256: c7095464616d2fa5e32f2fc5c1e56586ca299cd96f707fcd1dc6decd29376735
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, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or distributing further malware. The embedded content, though heavily obfuscated, likely serves to direct users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/aws?utm_term=best+answer+job+interview+weakness
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/1375935.pdf
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5fee61917cd58.pdf
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/82c102b6ec539b0.pdf
    • https://cdn-cms.f-static.net/uploads/4426407/normal_6054b1fe40335.pdf
    • https://cdn-cms.f-static.net/uploads/4449602/normal_601db1d5ecd33.pdf
    • https://cdn-cms.f-static.net/uploads/4393363/normal_6062affb88482.pdf
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/xobunugoxujo_noseg_kakosupuko.pdf
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/vajelunepiwifak.pdf
    • http://foyou.store/dujukizazj7zig.pdf
    • http://optarfes.com/43970638912rl07o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_df79c460eed4411d8a180607208eae0c.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_7717cf25fb1f4aa2b72d190565b0030e.pdf?index=true
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_e85cb7da8d5d440894efede2ef299af8.pdf?index=true
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_739197c2d06a42aeb6537f4093e5f147.pdf?index=true
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_617daebf43554613828382d7f567d8c3.pdf?index=true
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_aac5cfa8f2d444f3ab51a70e81fa7d9c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/41e85e03-33a4-4385-aa31-a163ba50ec20/jenux.pdf
    • https://uploads.strikinglycdn.com/files/c06b6543-6327-4fe1-936d-93a14d3d142c/10015765340.pdf
    • https://uploads.strikinglycdn.com/files/7c43c094-ce07-44a4-a7f0-ec4d90712146/how_to_install_polk_audio_subwoofer.pdf
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_ef84a11bd2aa464a825502f6c20eb6b2.pdf?index=true
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_fd88aed001534005b4a584f5740c4c82.pdf?index=true
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_3d308288d7744711b8cca317385a1d75.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_off00010033.bin
01b38f78f0b9fe7ee81f8edf92d1852e7251c764aef342d5777b58c3efe46fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 5128 bytes
font_01_sfnt_off000111d5.bin
1b9be78f54b78f4e976577d3f969217c47269eb7f642c6484fdc3208c549fee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 11112 bytes

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