Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a5d337de59585a…

MALICIOUS

PDF

74.5 KB Created: 2021-01-26 06:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 44d89c2f0a20ec23639d5d9c075e47be SHA-1: c9c00cead33d97b0cfb623c90c351b337a9b37f8 SHA-256: a1a5d337de59585a0eabf38dca6c4f89954993563596caeb9e673b858b3f3d6a
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious content, suggesting a phishing or link-farming campaign. The presence of a link to 'traffmen.ru' with a keyword related to server errors further supports the idea of a lure to a malicious site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/wb?keyword=out%20of%20memory%20permgen%20space%20tomcat%206 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5ffbb6fcb4a92.pdfIn PDF document text
    • http://complerbnp.com/cupcake_recipes_with_cake_mix_and_puddingcppgm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_6004a5e4a929d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366304/normal_6008923486bf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366965/normal_5ffa4fca8633b.pdfIn PDF document text
    • http://wppremium.org/movie_manager_for_maczetsj.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/504855.pdfIn PDF document text
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/fidobu-namokon.pdfIn PDF document text
    • http://newberginvestmentproperty.com/golanagoxakedugumojak6tv11.pdfIn PDF document text
    • http://wonnaturila.space/wonatozutiratinapuwism47t3.pdfIn PDF document text
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/d15a37.pdfIn PDF document text
    • https://gebedosoxabitox.weebly.com/uploads/1/3/5/3/135324181/lubamafiw-sevaduziwi-saterojewes.pdfIn PDF document text
    • http://italystore.pro/snowdon_castle_king_arthur0u357.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/viregujipowuru/97579760980.pdfIn PDF document text
    • http://fozovevozasox.epizy.com/45379574906.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/82125000496.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/ultrasound_guided_trigeminal_nerve_block.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/template_slideshow_after_effect_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 5588 bytes
SHA-256: 73769f1623618bbebddd653fc9e8d1018b0875c68694571bbc86a07674eb0967
font_01_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 10964 bytes
SHA-256: 69c24c70bfd3fbe5845a914c0b2f2dee53ec6a8c143993c008e337e16f9b8332

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