Malicious PDF — malware analysis report

Static analysis result for SHA-256 8116edd0af136dc6…

MALICIOUS

PDF

79.5 KB Created: 2021-04-03 10:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3f7541880ae743e106c8054578ccd228 SHA-1: caabb3c18dd7ba3dfffbce68766ed20ba644eae8 SHA-256: 8116edd0af136dc6a8368bd9e44e2881f41ce7689f5abd904f97be7b87fd6eb8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on disposable domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked resources.

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=the+lottery+movie+1969+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452389/normal_60601820364b1.pdfIn PDF document text
    • https://lipamonevarila.weebly.com/uploads/1/3/1/4/131453989/fanapisup_tomezimapuj_rixixozana.pdfIn PDF document text
    • http://7gusevshop.space/80182342819ywsd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_604424156d563.pdfIn PDF document text
    • https://nusubilumib.weebly.com/uploads/1/3/5/3/135347333/noboxuvin.pdfIn PDF document text
    • http://bagezokazuraw.medianewsonline.com/tamil_e_books_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_600aef2b24bb3.pdfIn PDF document text
    • http://ergors.space/rhetorical_devices_in_speeches_pptktx7k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5ffb4bacba036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5ff0868b180c2.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/nudorokudakolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_60555aae09407.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/luxilakokafuj.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/7184563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5ff91d3e2bcf9.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/46076141777.pdfIn PDF document text
    • http://itravelgr.com/xirugudunr5kf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_60367b27248f8.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/rumotibupuvupot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://susabumo.atwebpages.com/d_d_blank_character_sheet_5e.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_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 5396 bytes
SHA-256: 182c375f5d57b51312923fc21e1bd125085fc898e72cd460e7ef83aa5eda659b
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 11044 bytes
SHA-256: 58a06ffdab3b180cd160dc1aaaf53bf6abaa46823f699e7451c24697da2909c5

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