Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93ca0d40bb480de…

MALICIOUS

PDF

75.3 KB Created: 2021-06-04 01:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6bf15b9d62fd9910c48e81d43717b63e SHA-1: 8f9825a0b63c41fb69717585648ea85e58107ecc SHA-256: c93ca0d40bb480de6eac9ae1bf61d0008544aa4307c90c6796188a110dc60bd9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://infrive.ru/pbw?utm_term=game+killer+apk+android+5.1 PDF link annotation
    • https://xekotetumisas.weebly.com/uploads/1/3/5/2/135295861/befibug.pdfIn PDF document text
    • https://benukakaruw.weebly.com/uploads/1/3/4/7/134745121/4477492.pdfIn PDF document text
    • https://mojekofodu.weebly.com/uploads/1/3/4/6/134673543/2499003.pdfIn PDF document text
    • https://xusukimijep.weebly.com/uploads/1/3/2/6/132681495/zomidosir_rutekar.pdfIn PDF document text
    • https://nakofasojerurog.weebly.com/uploads/1/3/4/5/134592478/6569355.pdfIn PDF document text
    • https://tunopukiku.weebly.com/uploads/1/3/4/7/134775633/xodupad.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/56903867-4026-4b62-a6ca-c6b985cb0604/56779331211.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/w/file/fetch/144501501/a_series_of_unfortunate_events_books_1-13_download.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144506118/kudowikedewuwumepibebumif.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/88535653235.pdfIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144428871/hp_beep_code_3_long_3_short.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483dfa81-5059-4bb6-b613-bd3585b5ab1c/bakudub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59da8ac5-ba6b-402b-a1ee-09c5e0da58f3/80932720651.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/67459397062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3507eff5-2285-40e3-a5dc-36c884ca9378/macbook_os_x_snow_leopard_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f6585d6-f992-451e-807d-4c336bb6f50f/hammurabis_code_document_d_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121873b1-a44b-4896-b69f-c018c47db8e7/how_much_do_fire_inspectors_make_an_hour.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144578100/cdigo_processo_civil_antigo_pgdl.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/who_is_the_oldest_titan_in_greek_mythology.pdfIn PDF document text
    • http://pejuzor.pbworks.com/w/file/fetch/144547509/how_to_grill_using_air_fryer.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/54572946258.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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 5232 bytes
SHA-256: c3ff63fd32b7c906306081113f9e1eca5d08c9619fafd7b06e229a6ea979521a
font_01_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 10648 bytes
SHA-256: ca711159677853b96c275779b86e3cde28d6213abfdf3ad5f38fe3f59a9557ce

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