Malicious PDF — malware analysis report

Static analysis result for SHA-256 49397e1b73ba3690…

MALICIOUS

PDF

84.6 KB Created: 2021-02-12 06:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e654cdc6867b4f11715eb8372dc2ecd5 SHA-1: 7618d50baeaa595582e925665dfcd543f721ed32 SHA-256: 49397e1b73ba36903d3f556aefa324f7aeb29a5438eb27fe6f448f354ce0fbf0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://bologen.ru/wix?keyword=make+your+bed+by+admiral+william+h.+mcraven+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fe6876d61da8.pdfIn PDF document text
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/minesew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5fd9766feba40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373248/normal_5fe348c148124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_6022e94d297bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_5fe58f86097d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_601ccedb7a895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_6017a30788f85.pdfIn PDF document text
    • http://mailedflkf.site/669330320152wx4o.pdfIn PDF document text
    • http://itayoga.space/2040610503860u2d.pdfIn PDF document text
    • http://smallita.space/flicker_free_serial_macum24t.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
    • http://tavawefojob.epizy.com/88584299909.pdfIn PDF document text
    • http://puguvapalovuzub.rf.gd/64961565745.pdfIn PDF document text
    • http://dimonejoxu.rf.gd/adjective_worksheets_3rd_grade.pdfIn PDF document text
    • http://falalovoxiwada.epizy.com/bravely_default_decrypted_rom.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_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 5512 bytes
SHA-256: 2ca000efba8655f7cf04b3c1bf683a27287790d74f4e81c4bfae9943efdcf9a7
font_01_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 10736 bytes
SHA-256: 18764cee5f7a71fb4b89f5e3d3bab05004d35a7c8c5b9889f54f4e764e809be0
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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