Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0b1e9888643bbb…

MALICIOUS

PDF

68.2 KB Created: 2020-12-19 15:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6444f5371597f7cda4e99b4ac96bbb6c SHA-1: 17243493106bf8887b218f69611d5b51d21b97bc SHA-256: aa0b1e9888643bbb9db8b80933916d3afa4d22546cbeca1b9df6a8184e6dcc35
206 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'Showbox apk 2018 ipad', indicating a lure to download potentially malicious software. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffnew.ru/strik?utm_term=showbox+apk+2018+ipad PDF link annotation
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/3732075.pdfIn PDF document text
    • https://mukavotedi.weebly.com/uploads/1/3/1/8/131856112/4463141.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/kagufodule_sewowe_sopukag.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/2740040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459036/normal_5fa396e48ec53.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/zawikofaxo-kugamusofewoti-vevulifidelixut.pdfIn PDF document text
    • https://gemefakopegixi.weebly.com/uploads/1/3/4/3/134309359/valoxufase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_5fa6283fe0a2e.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/f7c167f.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/129de2cb-5ff2-4eba-abd3-81754ac1980d/basic_cell_structure_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7675e5-4ab9-4dc0-a858-1f45cf5ccf5e/basit_eitsizlikler_km_sorular_ss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d6c2f2-ac6b-4835-ac34-77315fe459c6/uncle_charles_principle.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/arma_3_steam_key_generator.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_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 5728 bytes
SHA-256: 2829ba1df4ddfdc32b9eb19212471a3d55f11bc9b2eaa1636ede1d8bd6e6b7f1
font_01_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 10728 bytes
SHA-256: 8e4626a45a9b7d9f2bbef041ac5906b4570593e51b71269435a373959aaae71f

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