Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b886faf95dd3b2…

MALICIOUS

PDF

73.6 KB Created: 2021-01-17 20:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e3fed54169a39d66d2c347c2ed007fed SHA-1: c2cdc1d9bca20d61a688ddd850c2b3835a292991 SHA-256: e2b886faf95dd3b226fe5cf3a641dbeeb63f3e78b479334b93e5010525560a3e
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=what+is+the+purpose+of+a+cover+letter+for+a+resume PDF link annotation
    • http://texewofe.22web.org/zulomijafazujedotivuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5fd8d2285d1c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_5fa02f1d60a33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5ff3cbe2e6210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fc423fd483f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_600326af2ea51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zapuwoz.epizy.com/23655481289.pdfIn PDF document text
    • http://waraxiv.rf.gd/leroy_somer_alternator_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/74203074685.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/calendrier_2019_imprimer.pdfIn PDF document text
    • http://judewal.rf.gd/tipos_de_cardioplegia.pdfIn PDF document text
    • http://xevorerokune.epizy.com/hanging_tree_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/65317039363.pdfIn PDF document text
    • http://pimibini.epizy.com/ccavenue_android_sdk.pdfIn PDF document text
    • http://xefivaz.epizy.com/fofawi.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/pekutisakofozila.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/avengers_the_initiative_read_online.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 5104 bytes
SHA-256: be5ef8b36ac488c5277a56dc8a2349c18a77078e47261a8d322f5b8cdd0e24b4
font_01_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 10552 bytes
SHA-256: d13098093e79e68f1c0477e33e4dcbb13c0d318c69082c403d5e11bc2a9df2b5
font_02_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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