Malicious PDF — malware analysis report

Static analysis result for SHA-256 161b914a592dfd7e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-15 16:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 69a7f8583f7075e62286c44ded355c0e SHA-1: 59c28a566b7532ce237a4f3415faae274c102a84 SHA-256: 161b914a592dfd7e3c927c3d36a25bd8a18dc88d63de8ebd2f103f15fa8f600e
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://seumenha.ru/aws?utm_term=everstar+air+conditioner+mpm2-10cr-bb6 PDF link annotation
    • https://nijodumedogale.weebly.com/uploads/1/3/6/0/136082157/jiguje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414852/normal_5fe37d1e5c72b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_6037fc46bed9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fd6381b846ac.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/vakus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_60419cd4558bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_5fd6292c5cd37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_601f77ac80bad.pdfIn PDF document text
    • http://gigirezaxut.iblogger.org/ti_nspire_student_software_mac_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_602535a22fbeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fec3c2c685b8.pdfIn PDF document text
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/mirogonuginetux.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/purufiz/zaxaxizuvifowumu.pdfIn PDF document text
    • http://dofumuligo.rf.gd/janepivis.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/biwosexapepefurakizuw.pdfIn PDF document text
    • http://bopuxenuxesozu.rf.gd/72390598225.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_2e2b5d6565e44edba5d8c9b563794ff2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/96410180047.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_4aa6209457f04d2f97b6b38f204c7990.pdf?index=trueIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_7f052c60063148dbaada09380934e781.pdf?index=trueIn PDF document text
    • http://tufebogepamik.rf.gd/72267387362.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_f9bbd7b5c7b9411abbedfcd54d9d683a.pdf?index=trueIn 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_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 5856 bytes
SHA-256: d3fb4f9056bb2d8518e7c2917b88bd079f250fe667b57dca6a82921b7bdf14f4
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10788 bytes
SHA-256: 5e90a305739867bb95348d0296e9be4bf26563d93ca0300f6aa0c67d219e63ca

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