Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d62f5df2bba6f9a…

MALICIOUS

PDF

81.1 KB Created: 2021-03-28 14:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 09696013fc1ae1f00aae395263102da3 SHA-1: ee54546b70034cd134898d7bcb0196862ad6ca0f SHA-256: 9d62f5df2bba6f9ac9fefb6fd82fed7de2af74ea990d7a0a979f4bdfa9b0d38e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URLs, including one pointing to a potential phishing lure related to an air conditioner manual. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious or scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=sharp+comfort+touch+air+conditioner+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485813/normal_602293f3e5031.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/devowowuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_602b35cc8fd73.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/95c98efc6.pdfIn PDF document text
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/3777298f8d6d2d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_6025819e959db.pdfIn PDF document text
    • https://wurudejokifar.weebly.com/uploads/1/3/0/7/130776262/takirolu.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/kelolif.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/2483541.pdfIn PDF document text
    • https://famopenagunabot.weebly.com/uploads/1/3/4/6/134688774/fogujesenudep_risofifafejo_xorosubetupe_levexujo.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/4490965.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/4f6a53c8-239d-48d5-8d68-e665ad2f93b3/gafisajeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1dd6563-0829-4545-a402-7c6783dbab37/76971515059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2723672e-7dab-4b4f-849e-4b1d6d7f8fe6/class_8_english_book_download_samacheer_kalvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b70116-a1a5-4390-9c97-72495ddbe2f7/how_to_add_effects_on_pictures_in_photoshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf2d928-c4a7-4b26-a0c5-2e0f65d113c2/on_combat_dave_grossman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60f45f9-2a57-4e90-a2c6-99cb801fc613/blue_moon_of_kentucky_dulcimer_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e83bf4a3-ad2e-4acc-ad28-1e156637cab4/what_do_u_mean_by_vibrant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2093ab2-d3a0-4e4d-9f3c-9f3c377585e7/visogawamuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a7b605-a736-4abe-ac24-e64103766005/craftsman_5hp_20_gallon_air_compressor_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1b4409-6af9-49a9-9af8-b51cb20ead03/67022008420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24c7b71-ac9b-4fae-8ecc-f3ff4d115c38/posazalejijoregakozowevi.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_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 5320 bytes
SHA-256: 8dd553d70c487593771e2cbbbfe227d10b82d9827ddf1c0a8c9a8cc6b1812053
font_01_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 11044 bytes
SHA-256: ca9178c241705e6efa8bbcd40dd8fde3daa7e585fc6ec714c05ec314c8d07d21