Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b45471b0f67cb2…

MALICIOUS

PDF

40.5 KB Created: 2020-04-06 06:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df2eb720529fac7f2e5b8c7a98222dec SHA-1: 95f0a767740eb75b44f33946ffaf70614441bd6f SHA-256: 94b45471b0f67cb272f98cbf8f7cf9965c87b271f45faf08f721fb8f5152c281
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF files with numeric or generic slugs. This pattern is indicative of a link farm designed to manipulate search engine rankings or distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation that these links are part of a malicious distribution scheme. No scripts were extracted, and the document body text is largely unreadable binary data, making it difficult to determine the exact nature of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://hbcphx.org/uploads/1/3/0/5/130551154/130551154.html#harbor+breeze+ceiling+fan+remote+receiver+replacement
    • http://authenticbreakthrough.org/uploads/1/3/0/7/130740129/2444331.pdf
    • http://scobasounds.com/uploads/1/3/0/6/130604566/gesabi_jevubolofoxe_sofeturolujow.pdf
    • http://pourlaprecieuseinc.com/uploads/1/3/1/4/131482963/1781511.pdf
    • http://paintingbuddies.us/uploads/1/3/0/2/130291884/satafineti-kefulu-zadipevow.pdf
    • http://hbade.org/uploads/1/3/0/5/130543168/ac30929e5ebd633.pdf
    • http://stcatherineithaca.org/uploads/1/3/1/3/131384694/vamesevekoxukol.pdf
    • http://artsandcraftsminiatures.com/uploads/1/3/0/2/130273776/dibosesip_pilit_pagemo_penavibisas.pdf
    • http://northwoodoutdoor.shop/uploads/1/3/0/8/130874381/693fd21be923d2.pdf
    • http://bridgethegapbusinesstrainingsolutions.com/uploads/1/3/0/3/130379844/kapafasikug_womuvopef_lupenu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060f7.bin
7e53587fd8d59743dd3554fc046c60017403b00dfeb6bc921341728f3025a2e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F7 7656 bytes
font_01_sfnt_off00007f1f.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1F 16204 bytes

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