Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1afc43b3d0fd974…

MALICIOUS

PDF

73.8 KB Created: 2021-06-09 00:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f814f446e946e619b10925d791b6716 SHA-1: 80d0fa9e378500dc104acb1640238221f74bb85b SHA-256: e1afc43b3d0fd974a004f059674fc79d21d5d96cd00a8c3bcdcc130165f37523
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or redirection attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=printable+clock+faces+worksheet
    • https://static.s123-cdn-static.com/uploads/4501962/normal_5ff807bdb6616.pdf
    • https://static.s123-cdn-static.com/uploads/4415046/normal_5fcf3f82c474b.pdf
    • https://dizawiwutap.weebly.com/uploads/1/3/4/6/134629961/49e904d3ca.pdf
    • https://static.s123-cdn-static-d.com/uploads/4371786/normal_60b1a2574c1d8.pdf
    • https://cdn-cms.f-static.net/uploads/4464303/normal_6012533ac4f6b.pdf
    • https://static.s123-cdn-static.com/uploads/4417426/normal_6007a00db3502.pdf
    • https://cdn-cms.f-static.net/uploads/4416802/normal_60613ad67f6a2.pdf
    • https://cdn-cms.f-static.net/uploads/4496815/normal_603b9954bb12e.pdf
    • https://cdn-cms.f-static.net/uploads/4424025/normal_605c75bd57dc0.pdf
    • https://cdn-cms.f-static.net/uploads/4499942/normal_5fdc6fd460f01.pdf
    • https://fitoposibex.weebly.com/uploads/1/3/4/3/134364930/vumivemake_lewixog.pdf
    • https://xoxizolijeru.weebly.com/uploads/1/3/0/8/130874154/bomefuvilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f1f4ddae-fd3c-42fa-8d4d-dd6490d31cc0/what_is_the_latest_update_for_note_5.pdf
    • https://uploads.strikinglycdn.com/files/68944039-0e80-4074-b6ca-ed2edd7c6c52/21626598726.pdf
    • https://uploads.strikinglycdn.com/files/64a4b497-f513-4510-9bfd-c1fd73c903ba/la_familia_de_pascual_duarte_summary_by_chapter.pdf
    • https://uploads.strikinglycdn.com/files/71d5dda0-c271-4e12-9c28-f476b4bc5b8c/star_wars_knights_of_the_old_republic_download_apk.pdf
    • https://uploads.strikinglycdn.com/files/fccee4b3-a950-43df-b736-8f52ac415820/fobasevalepuw.pdf
    • https://uploads.strikinglycdn.com/files/ca5eb0f3-bd55-4814-b4c2-260efce179e4/kinixa.pdf
    • http://vawijoj.pbworks.com/w/file/fetch/144469383/61915712938.pdf
    • https://uploads.strikinglycdn.com/files/26ed01e0-08d6-4ed7-be30-8f50922ecf56/47350388074.pdf
    • https://uploads.strikinglycdn.com/files/de09f37e-78f1-4905-9d20-49f345978791/tiwuto.pdf
    • http://mibegenav.pbworks.com/w/file/fetch/144449739/how_to_use_atwood_hydro_flame_furnace.pdf
    • http://davixezudi.pbworks.com/f/82682323876.pdf
    • http://subazim.pbworks.com/w/file/fetch/144610533/copperplate_calligraphy_guidelines.pdf
    • 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_off0000e3f0.bin
0f204eb9c414ba54c7e6b01791b3a418ce1fc4dbf6b0696b9fdc6b048b296127		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5268 bytes
font_01_sfnt_off0000f5e8.bin
7aa24897b835293f3bae092907eb4aeed7ac4f5b441f1a5dcc4cd8f1f548b82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 10548 bytes

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