Malicious PDF — malware analysis report

Static analysis result for SHA-256 900b73a4fae5b924…

MALICIOUS

PDF

67.1 KB Created: 2021-04-01 13:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 61446c6effb9c3e84bdee4223851f423 SHA-1: ceee674b48efadbb4b0977ad377b2e4a3111b915 SHA-256: 900b73a4fae5b924a2b9851e9cd547196f0eb647c48cafc81e8a43f0d871fadd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The primary URL, https://baarspo.ru/wix?keyword=mio+alpha+watch+manual, is presented as a manual, likely to trick users into clicking and potentially downloading further malware or submitting credentials. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=mio+alpha+watch+manual PDF link annotation
    • http://musofiron.ru/kosamusuv1t7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_600f905243536.pdfIn PDF document text
    • http://centerverifybadge.com/centurion_defence_academy_lucknow_fees5oft3.pdfIn PDF document text
    • http://totalcreditcheck.info/lipimiwsxzud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_60554a9419c88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484821/normal_5fec01f342d34.pdfIn PDF document text
    • http://questotzvezd.space/famlia_adotiva_de_michael_oher4ze9j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://repafow.epizy.com/xomasobazovegegofewo.pdfIn PDF document text
    • http://zikuwopuduzowe.epizy.com/temple_of_seitan_hackney_closed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3c9b9f-7baf-422f-a9b8-6edf6e45270e/jozarevuxepikopugavitap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ce0143-4eef-465c-ab7b-3636d7d5e4d8/how_does_trauma_release_exercises_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55130b95-3468-43df-901b-7c56c9939043/craftsman_16_electric_chainsaw_cmecs600.pdfIn PDF document text
    • http://xizefuta.rf.gd/pilivijolafupije.pdfIn PDF document text
    • http://bolomad.epizy.com/forensic_science_unit_1_review_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/21308151788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead90fdf-ade8-4a1e-b823-6f89bb5d3de3/71208053005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c67ced7-233b-40e2-8add-71823cd15eda/46342606047.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/zekepanisolikevevuv.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/23826033940.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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 4996 bytes
SHA-256: bd738322cba56d3b23850edc9e80b0a499b82d884b6440bc02fa11c76a8e4b55
font_01_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 9676 bytes
SHA-256: 30e4a0e2c3564064fbda1254e6ff87db3e5b511394d67dabdc71d84fe599b50f

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