Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a0d4f3567cf839…

MALICIOUS

PDF

75.1 KB Created: 2021-02-19 04:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d4a68e6ce7c99eef05f3ab170d5cdbf2 SHA-1: 78aa203d9bacb39812022b0278d1ac9c57cac8a7 SHA-256: a7a0d4f3567cf839eedba3d11e349d4d8c38a81313ebfc186350b9f1072e1641
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to connecting a printer, which is likely a pretext to disguise the malicious intent of directing users to potentially harmful websites.

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=how+to+connect+hp+laserjet+p2055dn+wireless PDF link annotation
    • http://slimerecipe.org/all_tamil_love_feeling_songsw37hb.pdfIn PDF document text
    • http://weraka.online/rick_beato_biography_wikipedia9u54m.pdfIn PDF document text
    • http://clipshd.design/article_spinner_software_full_version_free29z9q.pdfIn PDF document text
    • http://idealicaitalia-oficial.site/sd_media_launcherp448x.pdfIn PDF document text
    • http://scarcebook.com/18303567808zrzt4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_601dbc6084651.pdfIn PDF document text
    • http://naturfresh.fun/lame_deer_seeker_of_visions_quotesxj9y5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_600777ff36a52.pdfIn PDF document text
    • http://procripton.com/conjugacion_de_verbos_en_latindntpt.pdfIn PDF document text
    • http://bunnygummy.ru/9267907685vuk8h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_6023eb3376c3d.pdfIn PDF document text
    • http://uose.xyz/dotipegezusixipz2w6n.pdfIn PDF document text
    • http://idealicacolumbia.site/27769995664a1xw5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387040/normal_6006d9cb8fb0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369911/normal_5fe428fb6071c.pdfIn PDF document text
    • http://sparzha.club/winking_lizard_lakewood_party_roomhy9s7.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/neviwove/83034363129.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/sociological_theories_on_religion.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/zibob.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/sekin.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_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 5688 bytes
SHA-256: f9dc1444dfd29996dad8f995917bd5eeb6243d3a6596c668c187ce40b1b5de84
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 14440 bytes
SHA-256: 58da9ad32be49cb24c637017c08da2cca42775cda09e85f4fe8df27f6c791c75

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