Malicious PDF — malware analysis report

Static analysis result for SHA-256 b250be1e39b90257…

MALICIOUS

PDF

63.3 KB Created: 2020-11-19 09:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c8cbddd219305c9f43ff56d2653dec28 SHA-1: d3da8cce204655649c883761464f60e7618f4cf1 SHA-256: b250be1e39b90257027001ffa7b348a4938cb27939e300f00ec8fbb0e03f296c
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://trafftec.ru/strik?utm_term=palme+9+s%25C4%25B1n%25C4%25B1f+biyoloji+pdf PDF link annotation
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/72295.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/xiban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5f8fb09d4bb84.pdfIn PDF document text
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/nomavip_wugarazuvej_kuvozesux.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/ce46b443f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f8ab9ff51188.pdfIn PDF document text
    • https://menusopam.weebly.com/uploads/1/3/4/5/134597334/6ee7e198.pdfIn PDF document text
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/zadibafeti-jopozobaxozu-larejamonemed-pajixazibojo.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/2918955.pdfIn PDF document text
    • https://wupuvogobed.weebly.com/uploads/1/3/4/5/134507139/dutata.pdfIn PDF document text
    • https://judezirebesos.weebly.com/uploads/1/3/4/6/134669344/7436488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5f94980005168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f8c50a454b85.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/cb411581-a2c1-48bf-a5f3-8b8e41317f20/xerafaperiloxoxewufiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66bac621-07cb-43ea-97b8-472373f7dd55/73298828149.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB2 5600 bytes
SHA-256: ca31e2623d170690c044a81e637ee7101ec0f50e5a27b2254c07775a4cfecfc7
font_01_sfnt_off0000cdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 10172 bytes
SHA-256: 184f79a294bd07a598d003eabce257cdc142e79554824de46396c419a316813a

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