Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6428395e4f2d54…

MALICIOUS

PDF

70.7 KB Created: 2021-03-31 16:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a75300c8e606e46da18941717d9d455 SHA-1: 926e911ef10fdf4dff1e8924094cfb653d4bd9d3 SHA-256: ef6428395e4f2d54d57cb26eb0f36e14ccb00947c77c90ab3eab5d84163c3ed3
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 0.9956

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://mezovuduw.ru/wix?keyword=dfs+reference+guide+for+state+expenditures PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493876/normal_601dfd82b19bb.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/livivapupexep_togevalu_zujof.pdfIn PDF document text
    • https://jerigarapo.weebly.com/uploads/1/3/5/3/135327201/ed1185a729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_604dd31d9c7ee.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/29982166859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_6022b4352a179.pdfIn PDF document text
    • http://gixodugesu.medianewsonline.com/wetaripinowute.pdfIn PDF document text
    • https://vebupixe.weebly.com/uploads/1/3/4/8/134854050/mamisusotub.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/45281664775.pdfIn PDF document text
    • https://gagebopa.weebly.com/uploads/1/3/6/0/136051288/mazegupakuli.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/6f00fbc92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5ffc01829a3b2.pdfIn PDF document text
    • http://xudisoda.66ghz.com/reality_is_broken.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/types_of_altruism.pdfIn PDF document text
    • http://dewobazul.22web.org/american_truck_simulator_apk_obb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kasegame.rf.gd/area_of_sector_and_segment_worksheet.pdfIn PDF document text
    • http://volomuladifute.rf.gd/activities_of_daily_living_index_form_ontario.pdfIn PDF document text
    • http://vilulew.rf.gd/73501172867.pdfIn PDF document text
    • http://rogadeza.epizy.com/90851909615.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/adrenal_insufficiency_guideline.pdfIn PDF document text
    • http://lezujepadu.rf.gd/44599327101.pdfIn PDF document text
    • http://felubefetixiwu.rf.gd/mole_concept_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/the_hunger_games_mockingjay_part_2_movie_download_in_hindi_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/net_framework_2._0._5072_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/31825721065.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/kidde_1275_smoke_alarm_replacement.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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 5356 bytes
SHA-256: a674d6eb10ae8b7ae00a7db692fe727ab4f47329d38fbd16988779575dae2665
font_01_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 9636 bytes
SHA-256: 36335fd732a2bda64b95eb53d0c1c8569dd553563188fd3d2f374d6bdeacaaee

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