Malicious PDF — malware analysis report

Static analysis result for SHA-256 215c201f47976a4d…

MALICIOUS

PDF

77.0 KB Created: 2021-03-13 16:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3d8600e88ddc91ef5d9ea5661f236f5c SHA-1: 10323c917f92af5537a19ed9c7cf66afe781949a SHA-256: 215c201f47976a4dc13eee196faca474d4f21b81eb1fbd95b9bd19cf2869d4d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, with one prominent external URI pointing to 'https://baarspo.ru/strik?utm_term=lateral+move+irrigation+cost'. This URL, along with another embedded PDF link, are the primary indicators of compromise. No scripts were extracted, but the PDF structure and external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=lateral+move+irrigation+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408983/normal_603a1b74b94f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_60348dc1485f8.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/el_bogotazo_historia.pdfIn PDF document text
    • http://terugate.mypressonline.com/why_would_my_check_engine_light_be_flashing.pdfIn PDF document text
    • http://dizofuses.mypressonline.com/adding_and_subtracting_rational_numbers_word_problems_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_60419c37b0b2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465131/normal_5fcd7f1889cfc.pdfIn PDF document text
    • http://sizerasadaxer.mywebcommunity.org/tegibigawolowegujem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajulugebimisu.myartsonline.com/nasepexemaxuvikagij.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_1c84bc714b20470aaa36195e3f6ae32a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fb16d5-12db-43f5-ae84-b2f510263c5c/88900815484.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/amrinder_gill_songs_ming.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_26fcbb15924f4c318790ffca2474be8f.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_9dab1b3b4aae4b8496ef35a2047f9dfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3c388b-7bde-4e2b-b66d-5d65dc9ca937/kizuzilojivi.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_0af77a13e231488794cad10bbcf8a42e.pdf?index=trueIn PDF document text
    • http://bowegasobufur.myartsonline.com/39204423814.pdfIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_c26e09a1999049d9a6c8817864a792d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/51678562061.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_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5120 bytes
SHA-256: 5801c8c6fd306d841e25353d2f557e30abfb026e39ddb06c410a680e87ec3f04
font_01_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 10896 bytes
SHA-256: fba2f587cccecb6d160cd20e618b166c57af0876780c7434c9c0664ba54335f1

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