Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f13633cef75a50e…

MALICIOUS

PDF

80.4 KB Created: 2021-04-09 22:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e7902b880f69d9bdd193ac6f881ce136 SHA-1: 2406e142db87d3654ecc0c4b1bdb33758d1e83f4 SHA-256: 1f13633cef75a50e9d7e805c0b5b758118d4517539372bdd484355e757405b99
186 Risk Score

Malware Insights

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

This PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

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://vilenefex.ru/strik?utm_term=time+of+contempt+meaning PDF link annotation
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/susufix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449397/normal_606decae5f727.pdfIn PDF document text
    • http://kogixuserevuf.22web.org/zesujuwitofozo.pdfIn PDF document text
    • https://xusumenebob.weebly.com/uploads/1/3/4/4/134478057/8522431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445869/normal_60046d0709bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5fe866cd4d32e.pdfIn PDF document text
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/7772631.pdfIn PDF document text
    • https://gomujivas.weebly.com/uploads/1/3/5/3/135321586/nirewifetena.pdfIn PDF document text
    • http://nomuvafemokin.iblogger.org/belajar_membaca_tanpa_mengeja_2.pdfIn PDF document text
    • http://fetidasobi.iblogger.org/93362924645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5fcc53f21a55b.pdfIn PDF document text
    • http://ch-redirect.icu/tojefibidafivaxechemh.pdfIn PDF document text
    • http://dutov.org/50648594547xgoks.pdfIn PDF document text
    • http://hotita.fun/babylon_ad_movie_songs4rrxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivipige.epizy.com/86657624886.pdfIn PDF document text
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_8ab70269393748838348c3e0fa026c95.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_dab1931049d943b9b200a7356ebc5205.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_7af655134a5a4cf2b04020feb721e66d.pdf?index=trueIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_1f1753e1fb1b4fbbb7ab50f9c0877a83.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_57237003fa4f4ec0a81816771409fa30.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_dce3f7c062de4de5ac828f86ab553f99.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_7824b77e1e6847febc899e25fa4c222a.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_8a2967506ab34dc5802809a8273f0990.pdf?index=trueIn PDF document text
    • http://puxajenosetav.epizy.com/bohemian_rhapsody_queen_songs.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_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 4980 bytes
SHA-256: 91e973dd0c2d80f9821b31198eba1b0ff6d0010cef203e54323169b6fa726421
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 11068 bytes
SHA-256: 0c2ce1c4006f21b6c4e711f325e5494fabef20009fb4e77c5a74cb5e269cc176