Malicious PDF — malware analysis report

Static analysis result for SHA-256 0275dfea4794bfe5…

MALICIOUS

PDF

66.3 KB Created: 2021-04-01 02:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 982e20dfd6f76253e6d1340950f00451 SHA-1: d85b2e81c6e510e4cc7b9ef375c1bf0070e808b0 SHA-256: 0275dfea4794bfe50d67e1dd06d9b94ea8c3510812adb90bb9926f7bd90a0919
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jumiwimov.ru/wix?keyword=matter+and+energy+chapter+3+reading+study+guide+a+answers PDF link annotation
    • http://shoppingyxplus.xyz/airplay_dlna_receiver_pro_apk_freez3kyd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475997/normal_5fff67c0bc824.pdfIn PDF document text
    • http://kexopikusubewul.22web.org/dojonomagazojo.pdfIn PDF document text
    • http://mushygushysayings.com/28041387145ynkcp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506170/normal_60518dbabdfbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_602614c55abab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokogini.rf.gd/algorithm_tutorial.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/asp._net_gridview_footer_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce8fb4c-ccdc-4cc0-b742-d85c9126fe9c/what_does_bonne_nuit_mean_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/70213123479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b3b1d5-f9c6-4fba-b760-551a377c065d/written_argument_format.pdfIn PDF document text
    • http://momalovategur.rf.gd/convertir_de_a_word_online_small.pdfIn PDF document text
    • http://kiwusegofavuto.rf.gd/free_powerpoint_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/fiworixevurazorotisafu.pdfIn PDF document text
    • http://mujasanowagug.epizy.com/nakenimipesasijanizi.pdfIn PDF document text
    • http://lejokadedemixo.rf.gd/debediwi.pdfIn PDF document text
    • http://motiwop.rf.gd/radio_thermostat_reset_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537a794e-b708-438f-8c23-935c3ae76238/types_of_lyric_poetry.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_off0000c7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 5664 bytes
SHA-256: 917407165aacc9283e315ca6d5648acaefe311e9284abf4f3aa1f5e6762a3a22
font_01_sfnt_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 10036 bytes
SHA-256: 46a1db3728e305f75d7b5a78568c55e2587dabe2040cd67b45ad6692b7dab11f

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