Malicious PDF — malware analysis report

Static analysis result for SHA-256 d327d3c07881eb86…

MALICIOUS

PDF

67.1 KB Created: 2020-11-11 05:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 65e331f64a8d686d62611d0cf531c53d SHA-1: dc0e592844ddf5c866985a94434ead175586f8fc SHA-256: d327d3c07881eb8611c299299f70f91f17e059c8ed2f33475acc70baa13bfe0a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of links pointing to various domains, many of which are hosted on disposable platforms, indicating a link farm designed to obscure malicious destinations. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?keyword=apush+chapter+10+terms In PDF document text
    • https://tuxiwuke.weebly.com/uploads/1/3/4/6/134611110/poxelamigin-pusujesuvuleg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8729eed27d6.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/40ddfa4d7f4e3e.pdfIn PDF document text
    • https://fegoparowewara.weebly.com/uploads/1/3/4/3/134321013/gawifofijokiluj-patifututulap-vagataxinun-ranibidetusa.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/wolezojoz.pdfIn PDF document text
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/jakajivarekabifiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f9a23b885f9e.pdfIn PDF document text
    • https://xabisemegebo.weebly.com/uploads/1/3/4/4/134491474/fowutoz-kabobesumedat-nosojano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5f91e0f466df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f8764c6c5dbd.pdfIn PDF document text
    • https://mafopobivo.weebly.com/uploads/1/3/4/3/134322173/tewajijos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fa42d159fc93.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/8d250017-d0f8-4dd2-a1c3-25e5305eb496/the_boxer_ukulele_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31a464d-f2ef-4d14-9ac4-3a8d1cc3b8ea/fibibezumi.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_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 5324 bytes
SHA-256: 6ca855d65afa94a4c6df3b0e3d100a77eb3097c7b69aab5abd4f82a34088350a
font_01_sfnt_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 10140 bytes
SHA-256: 6eb964a8e0f9e52fc4df5cb5ad536617de653a89a6f2ccf305c1c0bfeb34acb8

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