Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bfe7a9a6750486…

MALICIOUS

PDF

72.7 KB Created: 2021-04-07 07:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ac2414790dd93e81cc620d172b045ced SHA-1: e718b5e8564e25470a39a55c88838e1bc23c8963 SHA-256: 58bfe7a9a675048602e2435f23fa0c2a2d1ac7c6ac5b2aa07d85bc6a0fb4d2b7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One embedded URL, https://nipisod.ru/wix?keyword=shut+down+your+screen+week+pros+and+cons, is particularly notable. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=shut+down+your+screen+week+pros+and+cons PDF link annotation
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/5141317.pdfIn PDF document text
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/9030824.pdfIn PDF document text
    • https://fumimukewagur.weebly.com/uploads/1/3/5/3/135321221/juresosiloto.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/zokekakabu.pdfIn PDF document text
    • http://onlineeshop24.xyz/ghatna_chakra_in_english_201929hw5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_601ddf51ba9a3.pdfIn PDF document text
    • http://crispyset.online/82727344515f6dbi.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/7569680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_6063b894a7270.pdfIn PDF document text
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/5532943.pdfIn PDF document text
    • https://gavanigo.weebly.com/uploads/1/3/1/3/131380609/f1b8ed95d57e.pdfIn PDF document text
    • https://rizafosukozesal.weebly.com/uploads/1/3/5/3/135346652/tunewivusofexa-gopisivedegu-fijoj.pdfIn PDF document text
    • https://wobipogipexiwom.weebly.com/uploads/1/3/1/0/131070125/pesujakuvikodad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_604f148d21c24.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/9jaQ0zh/74885806969.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/ak5jifw/53941154169.pdfIn PDF document text
    • https://cdn.sqhk.co/wozobifanu/gegiHhf/smartwool_promo_code_october_2020.pdfIn PDF document text
    • http://presalon.xyz/printable_applique_letter_templates_free39xej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 5492 bytes
SHA-256: 7df93743a3fbd62d4d4d76ec5153577770a52fdc471e593783fed418cb675f54
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 11368 bytes
SHA-256: c86c9d59e1c43dc56d28011a958cdfb24efbb61c5a85e764d8b4d6b9e0cffe82

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