Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb31dcf679a7a09f…

MALICIOUS

PDF

66.5 KB Created: 2021-02-24 07:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 343ef9b80732715096e9cb6247270fee SHA-1: 37e4f7d1a873e9f838202a575483ee36f3b1c7db SHA-256: bb31dcf679a7a09f32d3dabd49d3200a74fcd5108856b285cc0031224dedeb02
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to various external PDF documents hosted on disposable domains. The primary URL suggests a lure related to 'minecraft pocket edition 0.13 1 apk', indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=minecraft+pocket+edition+0.13+1+apk PDF link annotation
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/9609281.pdfIn PDF document text
    • http://pesale.pro/19400855233oa6sy.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/wipuxirurap.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/4068144.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471509/normal_5ff8c6b930858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5ff718bbddef3.pdfIn PDF document text
    • https://moxujudafetofa.weebly.com/uploads/1/3/2/7/132712376/sadafifivawilasikux.pdfIn PDF document text
    • https://bafuselowazela.weebly.com/uploads/1/3/5/3/135318440/mudafotilute_wafiv_solup.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/528630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5fd0391e1b501.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/7819781.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/bulizose_togakakuz.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/881734113f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_6022006044d40.pdfIn PDF document text
    • https://getesedalo.weebly.com/uploads/1/3/4/6/134629657/sedeg.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/mosezavor/convert_to_word_document_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/create_new_icloud_account_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/kilawarusitavid.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_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 5396 bytes
SHA-256: c68ab158c06bc61414779159a2738a559d312d2fa198097cf7dfee49948655af
font_01_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 10476 bytes
SHA-256: a22497d5208af49c5baf8fec765fc457e8fcbc1da7d50be6077cc0ccbcbd4b39

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