Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ed110194ec5c8a…

MALICIOUS

PDF

73.8 KB Created: 2021-03-04 19:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8b7af8ff61253f47fa3e53b0dd1fc0c0 SHA-1: 9586f4428ffcf13cf33fc29fa0d1b4ef1a361bac SHA-256: 83ed110194ec5c8a62fe2af7b3488ee836bf263978230aabaa42f11def2956eb
156 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 0.9998

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 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.
  • 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://maypoin.ru/123?utm_term=how+do+you+change+the+size+of+a+picture+in+paint PDF link annotation
    • https://dubonizu.weebly.com/uploads/1/3/1/6/131606556/xirisotoda.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/pesijuwozabax.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/brandon_marshall_boxing_record.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/pilix_sisewobewitir.pdfIn PDF document text
    • https://xojumemusip.weebly.com/uploads/1/3/4/0/134018475/ef8bcb693.pdfIn PDF document text
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/9a4aa1.pdfIn PDF document text
    • http://prosale.company/kakofulugugagedenufekiwufkuaqt.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/how_to_determine_property_boundary_lines.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/694560.pdfIn PDF document text
    • http://erogan24.website/71937933762qqes4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/133372322.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/93568808508.pdfIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_1c022ce9216d4f08a84eef1705286333.pdf?index=trueIn PDF document text
    • http://manosotidokef.myartsonline.com/sirapexokogugipifibafomo.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/30496388182.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/81623875651.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_500a479c6bcc4ce585dc8d572a120ad0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/zupin.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/girlfriends_guide_to_divorce_season_3_netflix.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_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 5592 bytes
SHA-256: 3ed13bbffc700ac1867230defbdffafaec9d26e1b582c0c070efc147f9360d7c
font_01_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 11588 bytes
SHA-256: 4c1c793cff7d4b2f73f24f4762ef3d91480a3bd4b72a1ef72c31732c26a40dd5

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