Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12a2fdc0fa0edf6…

MALICIOUS

PDF

70.6 KB Created: 2021-02-21 18:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 727cc66eea6aa66dfbb142c760bf0a79 SHA-1: 28b1f7b051fae40a7cd6e8afddc9de236dd09c99 SHA-256: d12a2fdc0fa0edf662ca66be252d192738775f52ad0e5e7aa20cd52602e02e70
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

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://seumenha.ru/123?utm_term=marlin+336+35+lever+action+price PDF link annotation
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/rezakib-repisete-mibosoxilu-lofulujod.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/e0a917.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/dagosotarivi.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/Tfh2dr3/68647792812.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5ff4fa360bd0a.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/mudire.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/7876182.pdfIn PDF document text
    • https://gafonubizaragu.weebly.com/uploads/1/3/5/3/135346264/diderekoketukaguz.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/3899880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_602ef0294c056.pdfIn PDF document text
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/likadofiben_wotedike.pdfIn PDF document text
    • https://liwuvena.weebly.com/uploads/1/3/1/3/131398027/f2dcea12f57de.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/vibanizizusi.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/sjficux/chocolate_covered_strawberries_recipe_no_coconut_oil.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/6293607.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/cihGmd0/rofaneritatofa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 5256 bytes
SHA-256: edb31ef01ff2d315e63602c6600df47a8042432f644801666f601f175b6e543b
font_01_sfnt_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 1756 bytes
SHA-256: b7d88799324b00ec566b7e3c430f802d07920be87832eec88d398d13b793f2ba
font_02_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10596 bytes
SHA-256: 70a1feaa05015d990bc2f3b6f040667f4e770fc21d7931653c1be4e1531f88a4

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