Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5de8d4dbb8fce9…

MALICIOUS

PDF

76.9 KB Created: 2021-03-17 05:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6955847a09584bae47c3f4e48eb88f71 SHA-1: 56defa198e004bb1b4aa68196f8a38b92e0da984 SHA-256: ac5de8d4dbb8fce9f3b43c532d440e25ef3647f2b1615ab5cfa5543a3e9693cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://baarspo.ru/wix?keyword=toshiba+17+inch+laptop+canada PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5ff972db0bb9e.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/3108549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_601bb314288e1.pdfIn PDF document text
    • https://talinupujisen.weebly.com/uploads/1/3/4/5/134591269/fcd14367716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_60382b2ece529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465398/normal_5fc773693e367.pdfIn PDF document text
    • https://nesotufofiwin.weebly.com/uploads/1/3/1/3/131381712/mufasufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455884/normal_60153804e889c.pdfIn PDF document text
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/5261602.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/70914060958.pdfIn PDF document text
    • http://kevebofuru.medianewsonline.com/97934141160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412181/normal_5ffd7f0675347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_603b9e3e6f797.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojufuka.atwebpages.com/backward_design_lesson_plan_sample.pdfIn PDF document text
    • http://baxewape.myartsonline.com/english_grammar_book_for_class_12_free_download.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/42122553001.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_bc74791ea0b74a528a44cc8a6799cddd.pdf?index=trueIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_4c09a044111b40ce930b15d43837601d.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_48964305c7bd4cc5abc2d932b9d6e3ce.pdf?index=trueIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_f6f90aeae5654464aa088e9f3519d723.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_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 5288 bytes
SHA-256: df948b2b14e67b9933e56a54cef7f7587899dbcfcb904af1275389ece00be501
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 11040 bytes
SHA-256: 3c054a8436e943c66c8ab2418035ec191097db9afd434781d54bc05183bc6f92

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