Malicious PDF — malware analysis report

Static analysis result for SHA-256 158919032c803628…

MALICIOUS

PDF

77.0 KB Created: 2021-03-14 11:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d6311d2c520e3b04e1a0399198e69d6c SHA-1: d8e148ef38139623772ff8738c0f19088f0b9567 SHA-256: 158919032c8036281e7918ac401c8f082a30be5e251a39c5b3c5b8b4e3de6aef
186 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=adjective+prefixes+worksheet+pdf PDF link annotation
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/dufowimusesej.pdfIn PDF document text
    • https://gevumonalibi.weebly.com/uploads/1/3/1/1/131164272/6608204.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/7cc0f3748bd49d.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/385c710f-7ef6-47de-a289-642111337f73/naeyc_standards_for_early_childhood_professional_preparation.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/dibujo_del_cuerpo_humano_y_sus_partes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd50b3a6-b7b9-4582-9b5e-cc0691175aed/the_chronicles_of_narnia_the_lion_the_witch_and_the_wardrobe_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/sasevofurifan.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/8684933581.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/gaf_armorshield_ii_data_sheet.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_0fec1d4798fc463f8fbfd6154d2166bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a5b330-66c3-4313-85f7-670c526611a4/80249883892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aae5b6a-6724-40ee-a5c7-24ed6596583a/bewajagamemowuzofitasopit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4b83cc-e05c-40a2-a720-a3077a6c37ed/14948349008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bab1949-78ad-458c-af36-9298c3f184f7/the_picture_of_dorian_gray_movie_1945_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c112d82-6a21-472d-ab64-daaacaef0d3a/tratado_elemental_de_derecho_romano_eugene_petit_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/tulafadejofukagibi.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/osrs_kandarin_easy_diary_guide.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_e7c9f217fce341d09bfdb3fd0ee6f135.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_d9ea927669da4d9787e49b64d047ed33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejideba/jio_whatsapp_video_call_app.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_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 5352 bytes
SHA-256: 89e147b21f9b5ae14587615cbf1340f95e109411c344be23d923c4650d32d073
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 10744 bytes
SHA-256: 39cb5dd0e1e4f20e51fb1d50608a165f1be9f3e5ddae6eb1ddff0ff295210136