Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d39f35430d31bd0…

MALICIOUS

PDF

75.2 KB Created: 2021-05-29 05:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f6cecdbff8bdb581c4fc44482f67cd6d SHA-1: d88372975dce8254975292aa23db4405aa2b3c67 SHA-256: 7d39f35430d31bd0bdb74e1806bacf0ee73bb6f3082698f2cc2e7d2a9b515bed
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with one prominent URL being https://druttle.ru/123?utm_term=clash+of+clans+base+design+app, suggesting a phishing or SEO manipulation tactic. The presence of many links on disposable hosting further indicates a malicious intent to distribute or redirect users.

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://druttle.ru/123?utm_term=clash+of+clans+base+design+app PDF link annotation
    • https://detofupupe.weebly.com/uploads/1/3/1/3/131384021/88839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_6032c762af8e1.pdfIn PDF document text
    • https://vatunumorese.weebly.com/uploads/1/3/4/8/134866462/6eaca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_601c994e59b08.pdfIn PDF document text
    • https://ximilebikunupi.weebly.com/uploads/1/3/4/8/134875253/2939459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fe50d97017d4.pdfIn PDF document text
    • https://xalorato.weebly.com/uploads/1/3/4/3/134317389/43cb2.pdfIn PDF document text
    • https://senakubedezozi.weebly.com/uploads/1/3/1/6/131606366/4eae6d.pdfIn PDF document text
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/31898c05801d6b0.pdfIn PDF document text
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/539563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490735/normal_6004beacb528c.pdfIn PDF document text
    • https://luludexo.weebly.com/uploads/1/3/5/3/135322363/9655e39eb2a.pdfIn PDF document text
    • https://bigakajufejala.weebly.com/uploads/1/3/4/2/134265656/5678055f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_60588a26e8996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_600f0a6b6e97d.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/0aab7ca1-fcb1-4c08-9528-a1ba264a72d2/wepep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38afff99-0c27-43cd-8d6e-609daacd8e95/what_mattress_has_a_lifetime_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a819c5-5303-45d6-8d5e-720d23b3294a/lets_get_real_or_lets_not_play_chapter_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59819e93-bed9-480d-903f-8266733969d8/63114123646.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 5364 bytes
SHA-256: 345ccc1b2f1cfb204ae05270bf0aba269ae792c8bdb2b4329060b8eb1778f1f5
font_01_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 9872 bytes
SHA-256: 88db2264045cfc2fc734f70f9ad94f261ee9b5d0aabfca43ce37ef9f0e9b6692

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