Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d13a1e4536a6a95…

MALICIOUS

PDF

75.1 KB Created: 2021-03-09 23:30:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b2a216615797b64e1b91f478fcf0a99f SHA-1: 2ff085396b45d162e5cb91ea11554439d7f97b88 SHA-256: 4d13a1e4536a6a95c3f900390372e2b998cda05bd780ed45bb94d3830f4e7c90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document uses a lure related to changing a ResMed filter to entice users to click on embedded links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document is designed as a link farm hosted on disposable domains, with multiple distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=how+to+change+resmed+mini+filter PDF link annotation
    • http://mapotilij.mygamesonline.org/79551078853.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/6626639.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/7259481.pdfIn PDF document text
    • https://voxisazemiruza.weebly.com/uploads/1/3/1/8/131871554/1bdffb1.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/think_and_grow_rich_ebook_kindle.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/19677936697.pdfIn PDF document text
    • https://maxamiboxu.weebly.com/uploads/1/3/1/6/131607029/jeruvupola.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/vezigepubezeraler.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/xolisojelagufalutuletitix.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/amphitryon_kleist.pdfIn PDF document text
    • http://bakigamokesu.22web.org/guporudonedezivobodo.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/9328b31b-e062-4879-9cf9-9ea608dd6403/64227155940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82e639d-4553-45a8-a259-e890f069f993/red_cross_first_aid_training_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b47991-ce02-4af7-9e1b-e4549cd1b1c8/model_3_price_drop_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76e158b-ff93-481f-a8fc-8ef73b82f898/ben_hogan_five_lessons_book.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/6332271192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474fee2f-3ca8-4f96-ab0f-58906d6db0d5/is_there_an_android_equivalent_to_procreate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2b8b5f-2dc5-47ce-8a40-0cacbf6b9e00/icewind_dale_enhanced_edition_multiplayer.pdfIn PDF document text
    • http://pezamax.myartsonline.com/convertidor_musica_gratis_mp3xd.pdfIn PDF document text
    • http://kexobub.rf.gd/awadhesh_premi_video_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e360dc2-3b4f-499c-99fb-c93854d62d53/minopowarebulos.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_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 5488 bytes
SHA-256: 5a2da1407c3e36d7bf2f848d58f3cebc2043a30212eb6ade2164fa5da4ea16e0
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 10520 bytes
SHA-256: 9698d79c4247e40c7b8aaebf241e7b589d5ba606accd587b79ccb24e0bbf11cc

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