Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18e5c07021606f2…

MALICIOUS

PDF

74.3 KB Created: 2021-05-10 11:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6ec8e99c539b2f284499a7da8238e3cb SHA-1: 21d1f8520a8dbbc1e966116458237a39e56537f9 SHA-256: f18e5c07021606f28a7d194332528790d896410a747d33362ed67fe961a3f6ca
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=hush+little+baby+lyrics PDF link annotation
    • https://xarirutufe.weebly.com/uploads/1/3/4/6/134659575/jomupiz.pdfIn PDF document text
    • https://fuvejewitopi.weebly.com/uploads/1/3/1/0/131070508/5348e428.pdfIn PDF document text
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/23723d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408002/normal_60015d11623cd.pdfIn PDF document text
    • http://difavusimope.iblogger.org/happy_birthday_wishes_for_wife_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_601a79b075a7d.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/900678fc-4b1b-45c5-965c-eaf462c3af1d/digital_design_and_computer_architecture_2nd_edition_by_harris_and_harris.pdfIn PDF document text
    • http://felawikemuda.epizy.com/lagu_kisah_cintaku_cover_felix.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/android_sdk_28._0._0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69bd48a-0aad-4d70-8629-60020b56893d/xufiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054d65d4-5ad4-47fb-a82e-ee3d3bab18f9/criminal_law_notes_llb_in_hindi.pdfIn PDF document text
    • http://tobidenarero.rf.gd/lp_pneumonia_pada_dewasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9094993-9f4d-4896-9501-25698b13bcfb/weber_genesis_e-330_specifications.pdfIn PDF document text
    • http://nufewusuk.rf.gd/vapiwarewotugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece5ec98-da86-4efc-a36c-87db11748786/60593612953.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/que_es_un_problema_de_investigacin_yahoo.pdfIn PDF document text
    • http://safonakidu.rf.gd/77130401196.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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 5092 bytes
SHA-256: f2cb4fae9e1a395f518b8bdfe5ebd1a487602f178f4271eae7daee0c918d46c1
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 11448 bytes
SHA-256: 48a93f462d528481374fa409333bcb975af78bff611d1e600ee54b590aa7c81f

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