Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7ae39f46b08a7c…

MALICIOUS

PDF

94.8 KB Created: 2021-03-02 23:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b53deae04a32da642538245081a7ebc3 SHA-1: f9fd0d5a96a32da8747c4d48a8b125881581e0d9 SHA-256: ca7ae39f46b08a7c9ea7d7208b9cab27d37a28d017c91c80dcfdf77c05abd875
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to zajinet.ru, likely serving as a lure. The document body, though obfuscated, suggests a deceptive pretext related to a book analysis, aiming to trick users into visiting the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=cronica+de+una+muerte+anunciada+analisis+critico PDF link annotation
    • http://nogurufegu.mygamesonline.org/67184025281.pdfIn PDF document text
    • http://bimojulumefa.iblogger.org/sekimesapugidubanuroxer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426967/normal_5fe3a7926672a.pdfIn PDF document text
    • https://jumolixebeze.weebly.com/uploads/1/3/4/3/134352805/1902969.pdfIn PDF document text
    • http://gazzsheff.xyz/95579590611f8lfx.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/215ddd.pdfIn PDF document text
    • https://piguvedulo.weebly.com/uploads/1/3/4/7/134724556/fobijusozesu.pdfIn PDF document text
    • http://prostotit.site/xuzuvujzk5w.pdfIn PDF document text
    • https://zigakenipipoto.weebly.com/uploads/1/3/4/1/134131781/e3cff9e28.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/zuguvoxoki/adobe_photoshop_app_free_for_android.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/who_is_the_hottest_in_bts_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/mokelowebuv.pdfIn PDF document text
    • http://ritanuwo.epizy.com/39166060869.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/bard_guide_3._5.pdfIn PDF document text
    • http://tikolikenugim.epizy.com/chicago_manual_of_style_citation_web_page.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 22616 bytes
SHA-256: 65f3d242d0c97911a2d62fbd9a4a54aefc22093f15fb96f67d7c290782471b6f
font_01_sfnt_off0001271c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 4992 bytes
SHA-256: 75f4d1e993c4ffa1be797f4663a4c092d79d432eda222a4a93cab179b5365fb9
font_02_sfnt_off000137e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E8 11992 bytes
SHA-256: ff1cbaf531dead275fc70ae297eddfee52effe4b387052515278dc717234de16
font_03_sfnt_off00015f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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