Malicious PDF — malware analysis report

Static analysis result for SHA-256 e239d02be76c7465…

MALICIOUS

PDF

104.9 KB Created: 2021-03-30 21:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1c584eac3a485563416ded2ed5ccfd5 SHA-1: ddc7be178a56ab1e2c82d87e378ea41244815b85 SHA-256: e239d02be76c7465ba05766ed4c144df10a2fa0dc113f95c6e471ac3d4a07292
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/123?utm_term=jinja2+templates+in+ansible PDF link annotation
    • http://rozel.ru/how_to_count_to_one_thousandjn3ug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_601f004a88bc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411489/normal_5fce465756ff6.pdfIn PDF document text
    • http://braco.ru/xilegoxagozpzpsw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5fd7cd58b830d.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/booklet_templates_indesignk7778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409818/normal_5ffa8db7a6787.pdfIn PDF document text
    • http://gonzo-3d.com/11341249780iidxk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fc8d6bfc8c32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_5fd3dc0ebb260.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://elerctum.org/vakamuwakimezixzsj.pdfIn PDF document text
    • http://varistop.site/rak_vitrified_tiles_catalogue0kn4j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xulelaperimiku.epizy.com/mezarofisavokisik.pdfIn PDF document text
    • http://bemeridalazobox.epizy.com/madikobobimimoxupebonife.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_721a49c67b5d4c74aa3090c3906dcf19.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_697c05ede8ab4ed5853389dd6c2364ca.pdf?index=trueIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_40cde52bede94da29ca2f8bdb9af0178.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_off00014f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8C 5208 bytes
SHA-256: c053e05b1293c990b0bce9dfc12ea54b4eb056e442c2ab326591c05395b10c41
font_01_sfnt_off00016133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16133 16584 bytes
SHA-256: 355120774623be464e009b06a147dcc08e17d37649ef1fa6e0e3494e2ca600d1

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