Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f68fd114532ef5…

MALICIOUS

PDF

92.7 KB Created: 2021-04-28 19:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 54394c09ecb46616a87e4e7c4fd68d7f SHA-1: 9e66759d1ac16c4e33d48ff3cdfb46ef57628ef9 SHA-256: 67f68fd114532ef57dc91ad1ac912b84c10f7e1aaa7cd414bf869cd4ae97078c
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://nipisod.ru/strik?utm_term=what+were+two+factors+that+caused+the+bantu+migrations PDF link annotation
    • https://ganuwikudafo.weebly.com/uploads/1/3/0/7/130775291/5884523.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugisaxap/O4jjjdm/36895711637.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/SIezids/my_wish_list_in_app_store.pdfIn PDF document text
    • http://rezotu.xyz/7227216289246qd.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/OHijthd/48978996155.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/bghzidK/93781853084.pdfIn PDF document text
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/xorozimokewi.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/hfQojgU/68118925462.pdfIn PDF document text
    • http://probkin34.xyz/16541648828ojr1r.pdfIn PDF document text
    • https://donibirumot.weebly.com/uploads/1/3/4/4/134463545/pumukikepozo_tutafitigu_nupat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravojovi.epizy.com/62385079586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b405ff-090e-465e-bb13-d53f7263a4da/indira_gandhi_biography_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c962d512-567c-4dcd-8181-96cd075a98dc/suxub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7170676a-f1e0-44c8-b644-87f8a4be52ca/accu-chek_aviva_plus_system_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11bf65ab-a4ae-4d6b-adb5-77424ed78839/nesaramez.pdfIn PDF document text
    • http://bifagogop.epizy.com/fewivomusurejadabova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64096733-3818-49f9-a3b8-d5b9d407e227/zadim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d913a55-d72c-4a0a-8b95-62424b2d0a69/89701585072.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_off00012b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B89 5648 bytes
SHA-256: 053f916eba4b703478187c810afb12c55f10d72fde13af9dea9cc69174dec1c3
font_01_sfnt_off00013eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAB 11248 bytes
SHA-256: 881f06aa294efcfc9b1117e17b8f7e9c626ff8e8720cef2b4c91fc4bb9815d8f

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