Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d3b52a77ef700c…

MALICIOUS

PDF

67.1 KB Created: 2021-05-30 08:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 07c8be0ff29f7d6dbd699d18af4ad0b9 SHA-1: c78f09142466eafd0189a4eb0af0e3a1595ea174 SHA-256: 50d3b52a77ef700c388ade41505c44b10d74bbffcbbbbb44d3a0ee1449ae95d4
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=chhello+divas+full+movie+download+in+hd+480p PDF link annotation
    • https://tujowijide.weebly.com/uploads/1/3/0/9/130969571/fukiwas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_606ce4509da90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_603cae79f0a23.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485310/normal_60b11fe79328f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5fd9f58ebc5f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_603b52ae208a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_602170fa25562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_606495e14b034.pdfIn PDF document text
    • https://ponefapu.weebly.com/uploads/1/3/1/6/131637257/rowegikum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_605683e06aaa9.pdfIn PDF document text
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/punaka_figezotijo_dewozeviwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_5fdc260807bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fd09d5ce1024.pdfIn PDF document text
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/0f448397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480744/normal_5ff8bbeb5a007.pdfIn PDF document text
    • https://jofovavugelizud.weebly.com/uploads/1/3/4/8/134855980/2eb87cf5b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455670/normal_6007bbc5438d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405644/normal_5fcda13760301.pdfIn PDF document text
    • https://bafosuronam.weebly.com/uploads/1/3/0/7/130738527/detoturarig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 5668 bytes
SHA-256: a0ec6b9e1b68d6488f6eb5acb72a17bff6ca8a37964da7057d2354f8d2d59786
font_01_sfnt_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 9932 bytes
SHA-256: a715c3aada912f5e361898cb9d8fe13f706afb0821857d37948e0d86eccb1602

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