Malicious PDF — malware analysis report

Static analysis result for SHA-256 00581d7f48ff3f32…

MALICIOUS

PDF

77.7 KB Created: 2021-05-20 10:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6f7e0f10a4daeeed22fc841c5d8c01bc SHA-1: c2fc2a4926ace9c074568a5f3636b606d492c03a SHA-256: 00581d7f48ff3f324ec8f1616529d955539fb28be5f3c727efda1359b8e6f8f4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=which+week+does+baby+grow+the+most In PDF document text
    • https://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/lujugo-gatovo-giluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_60194f5366bf1.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/9331616.pdfIn PDF document text
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/tagavajepuwipup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_5fd36f2891922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_600e8a7cb12ee.pdfIn PDF document text
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/sulupewiwuwe-majejog-tekudafasil-nexugufotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6023d2587f5d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_606381e34d8c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_602d98e7ba011.pdfIn PDF document text
    • https://zadilomevesijob.weebly.com/uploads/1/3/4/5/134581884/tikukezeforufurepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484169/normal_5ff95150cb8ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/60676908479.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/colorado_state_physical_education_standards.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/bollywood_movies_hd_avi_free_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/27783682559.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/fafugixalivirabupulunow.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/biblia_de_estudio_reina_valera_1960_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/votenegukekidu.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/xapukebadobif.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/hong_kong_1_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/27351928610.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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 5732 bytes
SHA-256: 839e260fe32de3129597ec0dae1fb8c6a9555146959012754063762edc253da5
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 10860 bytes
SHA-256: f5b3dba20b48245af8f2e7d01bb793a4e97c1caf92e6646e0e22be36d528f9a1

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