Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89c9b852f715f1d…

MALICIOUS

PDF

70.4 KB Created: 2021-06-05 22:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ff58517b39afa7d673232bd25aa238b5 SHA-1: ce4eb3ccb58cfb61fb721ed1c18e6a65e29df1c7 SHA-256: d89c9b852f715f1d4bbef4eaff050d4ae87468f3364dcf1cfba1868ea789f501
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, appears to be related to educational worksheets, likely a lure to disguise the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=comparing+and+ordering+numbers+grade+2+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473638/normal_6040dcc87c9c3.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/bewuf.pdfIn PDF document text
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/4532169.pdfIn PDF document text
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/8e0b46f6ba059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_602c52c5c8aac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_602e7302390ce.pdfIn PDF document text
    • https://tavigawatogup.weebly.com/uploads/1/3/5/3/135389884/30831a55f7ed6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5fcb30616dc02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_603fb06c3563c.pdfIn PDF document text
    • https://purolitawi.weebly.com/uploads/1/3/4/8/134894903/wogase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fe74b0e6d0cf.pdfIn PDF document text
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/wusul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fc7b20aba188.pdfIn PDF document text
    • https://dawujorukola.weebly.com/uploads/1/3/4/6/134683436/f8217f5.pdfIn PDF document text
    • https://nivojekegup.weebly.com/uploads/1/3/5/3/135322075/jasofulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/552579fd-8ea6-48b8-ba66-b4455d5bef0d/1._dnem_tanzimat_iiri_genel_zellikleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d6d974-3aee-4dd6-b25d-3d3eb38a242e/lenovo_t420s_ram_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ab8d00-1549-461a-b094-19399014179c/mobofupotinafib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b8fbce4-0efa-46b9-a664-d1348e3bc5ec/is_using_profanity_a_sign_of_intelligence.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_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 5672 bytes
SHA-256: 443a68bd51d13b317d098f9afca7eb955f77424b5da9aa187b02b33973520cb3
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 10860 bytes
SHA-256: 3db03f4a098f1a2f089eb85afde0585be6e4c7e3c65909098952316859df4cd6

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