Malicious PDF — malware analysis report

Static analysis result for SHA-256 440dc81c8f5d762c…

MALICIOUS

PDF

69.7 KB Created: 2021-03-23 09:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3ef1925f1cad903c4d1b965b9cff36a0 SHA-1: d15b72e0a46c7343cec968ac6a7d8f8d4e5ed713 SHA-256: 440dc81c8f5d762ca2808adb94874c4be3ac235426a5be16bc1a503772a81faf
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 numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a 'battery charger manual'. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=schumacher+battery+charger+se+1052+manual PDF link annotation
    • http://delayikapy.xyz/old_school_gospel_music_playlistbl0bs.pdfIn PDF document text
    • https://pabelazulutibus.weebly.com/uploads/1/3/1/0/131070827/nixunazep.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/8698401.pdfIn PDF document text
    • https://rokerisokexojud.weebly.com/uploads/1/3/0/7/130738924/f9c3bae95.pdfIn PDF document text
    • https://topipanonotege.weebly.com/uploads/1/3/4/6/134679812/c4b6cabfbc7a.pdfIn PDF document text
    • http://prizinsta.online/economic_loss_doctrine_illinois065es.pdfIn PDF document text
    • http://afracheat6.xyz/xafafujibuvedoda039be.pdfIn PDF document text
    • http://uspex22.online/819041484726f890.pdfIn PDF document text
    • http://idealica-co.site/time_pass_magazine_download296nh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_9849798444c84062af630267b22a9cdf.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_d35fd02c8ceb48ad9904944396719502.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_bada38f3e6854128a73dbfed73c75ccf.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_4eabb91b5c204ed498169904f8261097.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_bf526e28ebf541d2a05db8cd8d5145d4.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_602594b63f2242779fa5b25eb519e444.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_c186174817994041a41e309316f6b898.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_a41803c51b2145fca6356cdc94f6f7d0.pdf?index=trueIn 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_off0000d065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD065 6008 bytes
SHA-256: 7cfd96dfa9dfc38789d0a27e8d5990486c272adc72f03ac55237abd9177d2294
font_01_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 10900 bytes
SHA-256: d6069ed53f57817119a8b8c12d797a5028786cdc544145c22eac14e3eefaece3

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