Malicious PDF — malware analysis report

Static analysis result for SHA-256 e118efbaf3cb4192…

MALICIOUS

PDF

96.3 KB Created: 2021-01-19 02:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 17061b7b3a9f6daaa4b7c6a152dbee42 SHA-1: 824f82807273dc93d42e25fc85fca13c2d5d9aea SHA-256: e118efbaf3cb41920a21097fe42e5296fefc56f22d0b77694c211abf1ed03d95
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=pandas+apply+function+to+column+with+condition PDF link annotation
    • https://site-1177540.mozfiles.com/files/1177540/sesipubuzef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_5fc30e1c0732f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449630/normal_5fffbd36525d8.pdfIn PDF document text
    • https://site-1175201.mozfiles.com/files/1175201/advance_auto_parts_battery_exchange_policy.pdfIn PDF document text
    • https://site-1206872.mozfiles.com/files/1206872/47521603862.pdfIn PDF document text
    • https://site-1172154.mozfiles.com/files/1172154/chrisye_aku_cinta_dia.pdfIn PDF document text
    • https://palogipotutaz.weebly.com/uploads/1/3/2/8/132814365/koxogowolegi_fuzeforisifa_pekotokukozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_5f98da69c1e47.pdfIn PDF document text
    • https://site-1202007.mozfiles.com/files/1202007/codycross_answers_group_25_puzzle_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezewu/adapter_click_listener_android_kotlin.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/94053763986.pdfIn PDF document text
    • http://giwofigu.epizy.com/zudojimazit.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/zijufovopaf.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013fc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13FC8 27892 bytes
SHA-256: a1de81564a37773125a3e7ff39c9621d3d30fca033ac60acc34d83670398a1ff
font_00_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 5492 bytes
SHA-256: a408abbbf585f1c521e8acf1db2a1d46aa76369f7bbffff5a30c1e0b1cada978
font_01_sfnt_off000117f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 11556 bytes
SHA-256: a63a6ffa9cd31eb58fdfbd08745e61e470139f0562a4d36fb32037942145f520

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