Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfd3846f083aded…

MALICIOUS

PDF

81.0 KB Created: 2021-01-13 23:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 808d384320c344ebdffcd3fce4bd509f SHA-1: 75fbfeb0966ac42b7412c881996c0ac56256e588 SHA-256: acfd3846f083adedcecbb3683cc2b153a5d68ca6450a14f665954ca65a87c4c4
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 at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

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://traffmen.ru/123?utm_term=the+cota+examination+review+guide+3rd+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_5fac4d9d2ce64.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/fapaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fd6561bbbc44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455645/normal_5fb27d65c07cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_5fb605314e532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_5fb01bf58cba7.pdfIn PDF document text
    • https://cdn.sqhk.co/zagusebipin/dSnYijf/midefukurojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5fdd968f1a350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5fb564d9d019b.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/rupezepezori-gaxemutabevini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/kotokigodopiz.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/pazuv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 5360 bytes
SHA-256: 04cae017a60da84792fd3cc68aa4913d141ee04d5698d60cc08ef57596ce2db6
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 11376 bytes
SHA-256: dc18d8f11c80a23af9b1049dbe6708d42da684d8033cec93a0a676d402c917ae
font_02_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c
font_03_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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