Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac2a16074edf6e0…

MALICIOUS

PDF

75.0 KB Created: 2021-03-11 23:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41f53fb5f6b539858f1f30ee15cdfd59 SHA-1: d86a2164a31bb9693c0de35062b357ad0811ff0e SHA-256: dac2a16074edf6e05f887cd5b31c492ef9fab11c4c924263f2b18187f7ae71b5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/123?utm_term=outlook+calendar+import+csv+template PDF link annotation
    • https://cdn.sqhk.co/bexamajuw/XjhZ2c1/the_real_real_stock_symbol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5fcb94c4ef1f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_600a7de80756d.pdfIn PDF document text
    • https://rozeravepirasaj.weebly.com/uploads/1/3/2/8/132816036/digogu.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/hOifdgC/happy_glass_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/fvcRjfG/history_channel_vikings_season_4_episode_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_6046bec263528.pdfIn PDF document text
    • https://cdn.sqhk.co/nadizolobe/chgjd1b/orange_nasa_hoodie_target.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5ff08c6271cd6.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/iCzrgg4/serumojevaka.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/joruna-funofaxegutom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_5fd62d9077839.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/cSiejie/tuvotorukudavopodurawevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481828/normal_601c7197294ac.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/69f7d2401a0e.pdfIn PDF document text
    • https://jopizogado.weebly.com/uploads/1/3/4/3/134317888/04a093e.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/hdBYjil/link_samsung_health_to_fitbit_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_958f98bf7a0546f6b075128273e7dab2.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_22053fcf460441a59395b006beb8e46c.pdf?index=trueIn 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_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 5372 bytes
SHA-256: de6cd3e884e0bf35e2c8d700c256960586716abf6b60de98c585a892b8aa06f5
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 10180 bytes
SHA-256: 0543deb24fcffff59395f90a652c89fefb295fd5b7f7973ebc86e3c490e4f967

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