Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc22fa02d15bdb08…

MALICIOUS

PDF

95.8 KB Created: 2021-05-29 19:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cc1cedcbf22715421c2ad20841bc9ab4 SHA-1: c49d9c4737983d6bdd2b7786ec2e29a5f25ef320 SHA-256: dc22fa02d15bdb08caef156b9a962dcb898d624e48718254c19876e1b4ad731e
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=que+es+hermeneutico+en+la+investigacion PDF link annotation
    • https://kowonuzadanovit.weebly.com/uploads/1/3/4/6/134686130/9296935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422908/normal_5fdd02b278bba.pdfIn PDF document text
    • https://pagopolekabob.weebly.com/uploads/1/3/4/3/134305888/75750356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392854/normal_5fdeb35ecdd7f.pdfIn PDF document text
    • https://rurajisikite.weebly.com/uploads/1/3/0/8/130813509/586ce.pdfIn PDF document text
    • https://woralolur.weebly.com/uploads/1/3/4/3/134359953/sipujumo.pdfIn PDF document text
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/7004893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_5fe6ff1801c6f.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/3444807.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4409813/normal_60b00678f073c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_6033c0438a75a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469834/normal_5fcff6d5a6805.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/3234194.pdfIn PDF document text
    • https://rubirilubuz.weebly.com/uploads/1/3/4/2/134266621/fenudidufaloxinat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_5fe648528643f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_60419a95e5f85.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/ab7ee2e9-7600-437f-8690-888e0dc5daac/78634152022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010e949b-b2e2-4385-8517-4e5067f7b2e4/fizidazezasifinigoz.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_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 5332 bytes
SHA-256: 72a50d0cdb4d1729eb389722311cf122080cb96d8928002a67720aef5931b47f
font_01_sfnt_off000142c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C7 15084 bytes
SHA-256: 3b8f6890e3a4a8ba3885c5be5bbc19d5fa768c7d6925b956a432734eaf1b79f6

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