Malicious PDF — malware analysis report

Static analysis result for SHA-256 893b492a286b8427…

MALICIOUS

PDF

77.3 KB Created: 2021-02-11 02:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4eb3c44c5516995fa084bd485f75ffde SHA-1: 44f203081140e8f844f6c445e2fa29d0ea4251e6 SHA-256: 893b492a286b84274e0529daa7d922f90e255f658fada0a3ddaf907faf59fbab
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of a large number of embedded links, including one pointing to a known malicious redirector, suggests a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=idle%20python%203.%205%2032%20bit In PDF document text
    • http://prazdnikprosto.ru/balapam_patti_telugu_songmelh8.pdfIn PDF document text
    • http://gravkamen.ru/gutasezafusobfk2pw.pdfIn PDF document text
    • https://lixepugoguzezum.weebly.com/uploads/1/3/4/1/134132265/8515322.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/f6c33319daee.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/bWyibIR/high_heel_shoe_birthday_cake_images.pdfIn PDF document text
    • http://straponartist.com/37204174138ri5q2.pdfIn PDF document text
    • https://zoxexakaxikat.weebly.com/uploads/1/3/0/7/130739387/1998924.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/hhbtoE7/kunumodivam.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/lavejasix_febosupujetoveg_rukaxiwowazas_vokaguzezanutu.pdfIn PDF document text
    • https://gemiporelowagi.weebly.com/uploads/1/3/0/7/130775846/217707.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/bukofabosowimopud.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/3571895.pdfIn PDF document text
    • https://zeloseko.weebly.com/uploads/1/3/1/1/131163733/ac6f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepizokebador.epizy.com/brain_dead_full_movie_hd.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010db5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DB5 17844 bytes
SHA-256: 0b4bc9d153d0219d3e3df7ee17ade43e866cb5d0d25004cd1ca6b671e935a340
font_00_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 5196 bytes
SHA-256: 1ce872d13a71797e8cc4f1a5d1db984d9ee0221b9db18f627de88b402a623aa9
font_01_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 10492 bytes
SHA-256: b190147bd7999877edb33a9e6a82b3c3eac49a592ca43274c0913668e564fddf

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