Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4057dd9590b9d0…

MALICIOUS

PDF

74.8 KB Created: 2021-02-23 02:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0075264c010f115de0d4d73bc766c006 SHA-1: ceb77732604aa2fdfd434601e09abc710962ceb9 SHA-256: 1d4057dd9590b9d072e192b80336d967bf99f109571ef55e7537323081845cbc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to search terms and external URLs, suggesting a lure to a link farm or phishing site. The presence of numerous external URIs, many hosted on disposable domains, further supports a malicious campaign.

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://leonvi.ru/aws?utm_term=how+long+does+it+take+james+allen+to+resize+a+ring PDF link annotation
    • http://cybety.xyz/1612034809zfx9i.pdfIn PDF document text
    • https://kemusasozez.weebly.com/uploads/1/3/0/9/130969555/xodezerapoguv-doroxemuji-wataxixuvas-pefofakerako.pdfIn PDF document text
    • https://zolivapodi.weebly.com/uploads/1/3/5/3/135313307/zezet.pdfIn PDF document text
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/5191740.pdfIn PDF document text
    • http://vclean-sale.shop/402672322775e0iy.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/6537219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_60239656b6e79.pdfIn PDF document text
    • https://jitipukojid.weebly.com/uploads/1/3/4/7/134707402/9947450.pdfIn PDF document text
    • http://albl.ru/34549724123o8div.pdfIn PDF document text
    • http://lavka-karamel.ru/55895030626dl6ef.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/48300.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
    • https://s3.amazonaws.com/rivazixexuguri/series_circuits_physics_classroom_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/xiwufunezatogobo.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/light_and_electromagnetic_radiation_worksheet_answer_key.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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 5176 bytes
SHA-256: 8953179cf4b66a65b0af132ea764c918cc718cfc7822b39ca3ee4082e74eacf2
font_01_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 10392 bytes
SHA-256: 92ed9b40d73ad40fe8507072417f61d187b8c7f21ca1cbda95a0554e1ac0e67f
font_02_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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