Malicious PDF — malware analysis report

Static analysis result for SHA-256 1050b7397f2a4f77…

MALICIOUS

PDF

137.4 KB Created: 2020-11-21 14:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 50668f87a1da6214b92e070bb0899a36 SHA-1: af8de48e4237ade91becd5a3b57938637b490a27 SHA-256: 1050b7397f2a4f77b4e29ca1f44bf6984b5a4b0b091ccc46e3b13de09cac7851
186 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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt, potentially disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • 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 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://trafficel.ru/123?utm_term=drama4u+meteor+garden+2018 PDF link annotation
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/molaxalapegun_vujati_zujebifefa.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/maxatararabi.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/9723763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_5fab2d6732cb4.pdfIn PDF document text
    • https://tujigagozevako.weebly.com/uploads/1/3/4/2/134266307/3cb4db11.pdfIn PDF document text
    • https://pofewapat.weebly.com/uploads/1/3/4/0/134018592/ruzufali.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/2867588.pdfIn PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/4004344.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/jiladux-fatowoxev-lebamomumarim-piwifakixem.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/97058966998.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/stealth_guided_resection.pdfIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001bd16.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BD16 10104 bytes
SHA-256: 76b14b38df44b98d02d91b9ebfc081b152b46463207e4ecd148e16f7301eea27
font_00_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 54420 bytes
SHA-256: 0437e9d41ca3a0a705b1e33b6f444071439d45b1c7ecddc0bcca045d05d77848
font_01_sfnt_off0001a207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A207 5544 bytes
SHA-256: d8d879151da2a538d57457ed8943c243981ea20f322c00380367adb3e803ed83
font_02_sfnt_off0001b4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4D3 1648 bytes
SHA-256: 689662de208013ab3671d046fe250f86b05ece668ad65945bf3ea78cfc47b608
font_04_sfnt_off0001d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D99B 11628 bytes
SHA-256: b3c2ab85268e5b9bc06b0b9028d652a5ad260c6b92789473ac1dfaf9379b9d6d
font_05_sfnt_off00020061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20061 16512 bytes
SHA-256: a52bfd336668d844cf7709ec37a2ecbf4eeb12c1aca078aa2b7d2ac0ff0846bd

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