Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d88b5ac56f8103c…

MALICIOUS

PDF

84.7 KB Created: 2021-03-29 02:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 975214ddb8c16571607a2542551713e5 SHA-1: b902bc00ba00110eb5efb7625da18fad8206224c SHA-256: 0d88b5ac56f8103c6c32bc868d4e4eaa787c49228bb3d0b48a37ad9e421eb9d9
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-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://jacksth.ru/award?keyword=manual+completo+de+aberturas+de+xadrez+pdf PDF link annotation
    • http://muvepifare.mygamesonline.org/betamazusinef.pdfIn PDF document text
    • http://copyrightsupporteds.com/55108014376wl5tn.pdfIn PDF document text
    • http://buloshnaya.site/39726201962ueo2e.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/inheritance_paolini_review.pdfIn PDF document text
    • http://jatamonip.iblogger.org/lee_child_night_school.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/9240175.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/77398529568.pdfIn PDF document text
    • http://mejuzuw.scienceontheweb.net/96382692718.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/raletegotobin.pdfIn PDF document text
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/vavavapejegirafi.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/019af45e-45be-481e-9d75-595b65f8456c/tizuvusudaxebobolejejawef.pdfIn PDF document text
    • http://tefokubekaxo.rf.gd/avolites_titan_1_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b539ca-6842-42c9-ae43-34bbaa768a95/xukutotof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37bc9e1e-f218-4465-bbf4-9ffd3d05fbe2/kinikunol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36297f6-6b55-44d2-ad33-faa9427c55ed/moguzananudaxuzipani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d5352d-5d2e-439f-b5b2-312cd68aa30d/what_is_considered_to_be_a_large_effect_for_cohens_d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aeea0eb-de0b-4371-90f6-2b19b49ccbf3/10129115236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd74a53-232d-4c05-8f56-8e4fe8316fe6/nedujapusovijokon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c831397-16c0-46e6-bd43-67d64b91efef/bewusajuzisugisorunesi.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_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 5564 bytes
SHA-256: eb81a5c6fbf572e63e17cb6cc3bd56b48c97030254df8da7b810b02ba0ac7c91
font_01_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 13556 bytes
SHA-256: 04ead3041a6a0617a650551661619b15b24d8bdcaa16561bb51bd31be7a28862

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