Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0044e6dc68310bf…

MALICIOUS

PDF

81.5 KB Created: 2021-05-29 08:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5e1a78233fdb66ebb06f45455cb0fef SHA-1: b176a190a5f2a8efc28d14421655769df92f9edd SHA-256: b0044e6dc68310bf24934a2d3d47246e76d6d43e486f4455caa6303a7eaa11e4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=what+is+hypothesis+testing+examples PDF link annotation
    • https://tetumuvagawemol.weebly.com/uploads/1/3/4/5/134522004/genigipezo_gefijija_jebupi_fofajogot.pdfIn PDF document text
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/5016496.pdfIn PDF document text
    • https://wovipoxutoluku.weebly.com/uploads/1/3/1/3/131383624/6070966.pdfIn PDF document text
    • https://lanekuloriko.weebly.com/uploads/1/3/0/8/130874063/pufugukabenitukok.pdfIn PDF document text
    • https://konanofekevofi.weebly.com/uploads/1/3/4/3/134367310/zuvej.pdfIn PDF document text
    • https://puwubebuserow.weebly.com/uploads/1/3/4/4/134403982/eea03af73c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fd9cdc8d0bd3.pdfIn PDF document text
    • https://sozulidalipidin.weebly.com/uploads/1/3/1/4/131437061/tudojativomot.pdfIn PDF document text
    • https://bulurumuz.weebly.com/uploads/1/3/1/1/131163623/liporalofobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_6043ec9cbd2f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490244/normal_5fe2f5f519f3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379984/normal_5fccebaec56b5.pdfIn PDF document text
    • https://jebupamix.weebly.com/uploads/1/3/6/0/136098333/begikusavitusinijuju.pdfIn PDF document text
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/6132941.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/da7c1e0a-1ef7-44f8-b8e1-1083fbe78913/epson_error_0x9a_fix_utility_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f1c1d7-a550-46a5-9035-ae1622122656/ravpower_wireless_charger_blinking_red_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7a0dc8-04f8-4328-94b3-6aa284ce4230/pilgrims_progress_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5c83da-7260-4825-99a2-fdf830d242b4/walt_disney_cinderella_story_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58e847d-fe48-4979-ab76-d40a801a880f/how_to_replace_pull_cord_on_troy_bilt_edger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418f5150-e3c1-4a34-97de-32c1838bbc74/how_to_become_a_dentist_assistant_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5301a7dd-44e6-4f46-b208-d6addc813fa1/how_to_make_a_banana_smoothie_without_yogurt_or_honey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740f7e70-73bc-4797-8234-ed738b69c315/30764576433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf53ee60-6db9-43e1-928d-7b6cf6d77097/65909129407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb797ec-c287-4c64-82e9-d18f19f78abe/how_to_write_short_concise_sentences.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_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 5320 bytes
SHA-256: d48d8505578a7862ea8fbd9aa6ba8d3638521424f57830548e6d9fbfa81325ac
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 11600 bytes
SHA-256: 8d77f66293b7706d845064cbf69a9eb2d97369df36a0be0d20b3dce9bf83e166

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