Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18ace2adb33b331…

MALICIOUS

PDF

77.5 KB Created: 2021-03-09 13:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d379ec793481b7bca37ea3244bffa35 SHA-1: 355e4707453e3ce84b6f5f305f3fa12ce2a5908c SHA-256: f18ace2adb33b3312ed36a855425c5d1d29ae2ebaccce8322ff9dd5fc63cbbdc
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 0.9997

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://nipisod.ru/aws?utm_term=free+printable+love+language+test+for+couples PDF link annotation
    • http://lifelalulenomip.mygamesonline.org/fagafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_6018d4120983e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490528/normal_603eba2a65ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_5fdc3168d13da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_603434bb8d29e.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/blacks_law_dictionary_8th_edition_citation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_600313d78e96a.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/como_ser_un_lder_en_el_trabajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_603e7517c2e5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465015/normal_5fe6028bdaef9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5ffcb7a90e72d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_60415d274763d.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/vodiwuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojonuta/rapujukeputesugovob.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_995d904610a14010be51579a12b7b113.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/747b1fda-6161-4c02-b099-f46fc1546320/26456194586.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/70119860946.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/center_tap_transformer_rectifier.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_2c217e2f1ab34dd1a08b6a6f167a748b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/270316b0-98d4-4867-94db-4b64897ffd36/poxoxudutez.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_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 5340 bytes
SHA-256: dc46dc61373adff060fb37ce5cb18db6b974498dafc54970aaad9420f1f9bb1f
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10240 bytes
SHA-256: cfdf169c28bd71bda07a2fcde9cbd0ff0d5d051d0b575d6d06a8d115ec9acd06

Open this report in the interactive analyzer, or submit your own file for analysis.